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Prokop J, Rosová K, Leipner A, Sroka P. Thoracic and abdominal outgrowths in early pterygotes: a clue to the common ancestor of winged insects? Commun Biol 2023; 6:1262. [PMID: 38087009 PMCID: PMC10716172 DOI: 10.1038/s42003-023-05568-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 11/09/2023] [Indexed: 12/18/2023] Open
Abstract
One of the fundamental questions in insect evolution is the origin of their wings and primary function of ancestral wing precursors. Recent phylogenomic and comparative morphological studies broadly support a terrestrial ancestor of pterygotes, but an aquatic or semiaquatic ancestor cannot be ruled out. Here new features of the branchial system of palaeodictyopteran larvae of several different instars of Katosaxoniapteron brauneri gen. et sp. nov. (Eugereonoidea) from the late Carboniferous collected at Piesberg (Germany) are described, which consist of delicate dorsolateral and lamellate caudal abdominal gills that support an aquatic or at least semiaquatic lifestyle for these insects. Moreover, the similar form and surface microstructures on the lateral abdominal outgrowths and thoracic wing pads indicate that paired serial outgrowths on segments of both tagmata presumably functioned as ancestral type of gills resembling a protopterygote model. This is consistent with the hypothesis that the wing sheaths of later stage damselfly larvae in hypoxic conditions have a respiratory role similar to abdominal tracheal gills. Hence, the primary function and driving force for the evolution of the precursors of wing pads and their abdominal homologues could be respiration.
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Affiliation(s)
- Jakub Prokop
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, 128 00, Praha 2, Czech Republic.
| | - Kateřina Rosová
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, 128 00, Praha 2, Czech Republic
| | - Angelika Leipner
- Museum Schölerberg, Klaus-Strick-Weg 10, 49082, Osnabrück, Germany
| | - Pavel Sroka
- Institute of Entomology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05, České Budějovice, Czech Republic
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2
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Mongiardino Koch N, Tilic E, Miller AK, Stiller J, Rouse GW. Confusion will be my epitaph: genome-scale discordance stifles phylogenetic resolution of Holothuroidea. Proc Biol Sci 2023; 290:20230988. [PMID: 37434530 PMCID: PMC10336381 DOI: 10.1098/rspb.2023.0988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/12/2023] [Indexed: 07/13/2023] Open
Abstract
Sea cucumbers (Holothuroidea) are a diverse clade of echinoderms found from intertidal waters to the bottom of the deepest oceanic trenches. Their reduced skeletons and limited number of phylogenetically informative traits have long obfuscated morphological classifications. Sanger-sequenced molecular datasets have also failed to constrain the position of major lineages. Noteworthy, topological uncertainty has hindered a resolution for Neoholothuriida, a highly diverse clade of Permo-Triassic age. We perform the first phylogenomic analysis of Holothuroidea, combining existing datasets with 13 novel transcriptomes. Using a highly curated dataset of 1100 orthologues, our efforts recapitulate previous results, struggling to resolve interrelationships among neoholothuriid clades. Three approaches to phylogenetic reconstruction (concatenation under both site-homogeneous and site-heterogeneous models, and coalescent-aware inference) result in alternative resolutions, all of which are recovered with strong support and across a range of datasets filtered for phylogenetic usefulness. We explore this intriguing result using gene-wise log-likelihood scores and attempt to correlate these with a large set of gene properties. While presenting novel ways of exploring and visualizing support for alternative trees, we are unable to discover significant predictors of topological preference, and our efforts fail to favour one topology. Neoholothuriid genomes seem to retain an amalgam of signals derived from multiple phylogenetic histories.
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Affiliation(s)
| | - Ekin Tilic
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
- Department of Marine Zoology, Senckenberg Research Institute and Museum, Frankfurt, Germany
| | - Allison K. Miller
- Anatomy Department, University of Otago, Dunedin, Otago, New Zealand
| | - Josefin Stiller
- Centre for Biodiversity Genomics, Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Greg W. Rouse
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
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Herhold HW, Davis SR, DeGrey SP, Grimaldi DA. Comparative Anatomy of the Insect Tracheal System Part 1: Introduction, Apterygotes, Paleoptera, Polyneoptera. BULLETIN OF THE AMERICAN MUSEUM OF NATURAL HISTORY 2023. [DOI: 10.1206/0003-0090.459.1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Affiliation(s)
- Hollister W. Herhold
- Richard Gilder Graduate School and Division of Invertebrate Zoology, American Museum of Natural History, New York
| | - Steven R. Davis
- Division of Invertebrate Zoology, American Museum of Natural History; Laboratory of Developmental Neurobiology, Kanazawa University, Kanazawa, Japan
| | - Samuel P. DeGrey
- Kimberly Research and Extension Center, University of Idaho, Kimberly
| | - David A. Grimaldi
- Division of Invertebrate Zoology, American Museum of Natural History, New York
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Prokop J, Nel A, Engel MS. Diversity, Form, and Postembryonic Development of Paleozoic Insects. ANNUAL REVIEW OF ENTOMOLOGY 2023; 68:401-429. [PMID: 36689304 DOI: 10.1146/annurev-ento-120220-022637] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
While Mesozoic, Paleogene, and Neogene insect faunas greatly resemble the modern one, the Paleozoic fauna provides unique insights into key innovations in insect evolution, such as the origin of wings and modifications of postembryonic development including holometaboly. Deep-divergence estimates suggest that the majority of contemporary insect orders originated in the Late Paleozoic, but these estimates reflect divergences between stem groups of each lineage rather than the later appearance of the crown groups. The fossil record shows the initial radiations of the extant hyperdiverse clades during the Early Permian, as well as the specialized fauna present before the End Permian mass extinction. This review summarizes the recent discoveries related to the documented diversity of Paleozoic hexapods, as well as current knowledge about what has actually been verified from fossil evidence as it relates to postembryonic development and the morphology of different body parts.
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Affiliation(s)
- Jakub Prokop
- Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic;
| | - André Nel
- Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum national d'Histoire naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, Paris, France;
| | - Michael S Engel
- Division of Entomology, University of Kansas Natural History Museum, Lawrence, Kansas, USA;
- Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas, USA
- Division of Invertebrate Zoology, American Museum of Natural History, New York, New York, USA
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The Quality of Sequence Data Affects Biodiversity and Conservation Perspectives in the Neotropical Damselfly Megaloprepus caerulatus. DIVERSITY 2022. [DOI: 10.3390/d14121056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Ideally, the footprint of the evolutionary history of a species is drawn from integrative studies including quantitative and qualitative taxonomy, biogeography, ecology, and molecular genetics. In today’s research, species delimitations and identification of conservation units is often accompanied by a set of—at minimum—two sequence markers appropriate for the systematic level under investigation. Two such studies re-evaluated the species status in the world’s largest Odonata, the Neotropical damselfly Megaloprepus caerulatus. The species status of the genus Megaloprepus has long been debated. Despite applying a highly similar set of sequence markers, the two studies reached different conclusions concerning species status and population genetic relationships. In this study, we took the unique opportunity to compare the two datasets and analyzed the reasons for those incongruences. The two DNA sequence markers used (16S rDNA and CO1) were re-aligned using a strict conservative approach and the analyses used in both studies were repeated. Going step by step back to the first line of data handling, we show that a high number of unresolved characters in the sequence alignments as well as internal gaps are responsible for the different outcomes in terms of species delimitations and population genetic relationships. Overall, this study shows that high quality raw sequence data are an indispensable requirement, not only in odonate research.
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Karmeinski D, Meusemann K, Goodheart JA, Schroedl M, Martynov A, Korshunova T, Wägele H, Donath A. Transcriptomics provides a robust framework for the relationships of the major clades of cladobranch sea slugs (Mollusca, Gastropoda, Heterobranchia), but fails to resolve the position of the enigmatic genus Embletonia. BMC Ecol Evol 2021; 21:226. [PMID: 34963462 PMCID: PMC8895541 DOI: 10.1186/s12862-021-01944-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 11/23/2021] [Indexed: 11/24/2022] Open
Abstract
Background The soft-bodied cladobranch sea slugs represent roughly half of the biodiversity of marine nudibranch molluscs on the planet. Despite their global distribution from shallow waters to the deep sea, from tropical into polar seas, and their important role in marine ecosystems and for humans (as targets for drug discovery), the evolutionary history of cladobranch sea slugs is not yet fully understood. Results To enlarge the current knowledge on the phylogenetic relationships, we generated new transcriptome data for 19 species of cladobranch sea slugs and two additional outgroup taxa (Berthella plumula and Polycera quadrilineata). We complemented our taxon sampling with previously published transcriptome data, resulting in a final data set covering 56 species from all but one accepted cladobranch superfamilies. We assembled all transcriptomes using six different assemblers, selecting those assemblies that provided the largest amount of potentially phylogenetically informative sites. Quality-driven compilation of data sets resulted in four different supermatrices: two with full coverage of genes per species (446 and 335 single-copy protein-coding genes, respectively) and two with a less stringent coverage (667 genes with 98.9% partition coverage and 1767 genes with 86% partition coverage, respectively). We used these supermatrices to infer statistically robust maximum-likelihood trees. All analyses, irrespective of the data set, indicate maximal statistical support for all major splits and phylogenetic relationships at the family level. Besides the questionable position of Noumeaella rubrofasciata, rendering the Facelinidae as polyphyletic, the only notable discordance between the inferred trees is the position of Embletonia pulchra. Extensive testing using Four-cluster Likelihood Mapping, Approximately Unbiased tests, and Quartet Scores revealed that its position is not due to any informative phylogenetic signal, but caused by confounding signal. Conclusions Our data matrices and the inferred trees can serve as a solid foundation for future work on the taxonomy and evolutionary history of Cladobranchia. The placement of E. pulchra, however, proves challenging, even with large data sets and various optimization strategies. Moreover, quartet mapping results show that confounding signal present in the data is sufficient to explain the inferred position of E. pulchra, again leaving its phylogenetic position as an enigma. Supplementary Information The online version contains supplementary material available at 10.1186/s12862-021-01944-0.
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Affiliation(s)
- Dario Karmeinski
- Centre for Molecular Biodiversity Research, Leibniz Institute for the Analysis of Biodiversity Change/ZFMK, Museum Koenig, Adenauerallee 160, 53113, Bonn, Germany
| | - Karen Meusemann
- Leibniz Institute for the Analysis of Biodiversity Change/ZFMK, Museum Koenig, Adenauerallee 160, 53113, Bonn, Germany.,Australian National Insect Collection, National Research Collections Australia, Commonwealth Scientific and Industrial Research Organisation (CSIRO), National Facilities and Collections, Clunies Ross Street, Acton, Canberra, ACT, 2601, Australia
| | - Jessica A Goodheart
- Scripps Institution of Oceanography, University of California, La Jolla, San Diego, CA, 92037, USA
| | - Michael Schroedl
- SNSB-Bavarian State Collection of Zoology, Münchhausenstr. 21, 81247, Munich, Germany.,GeoBioCenter LMU und Biozentrum, Ludwig-Maximilians-Universität München, Großhaderner Str. 2, 82152, Planegg-Martinsried, Germany
| | - Alexander Martynov
- Zoological Museum of the Moscow State University, Bolshaya Nikitskaya Str. 6, 125009, Moscow, Russia
| | - Tatiana Korshunova
- Koltzov Institute of Developmental Biology, Vavilova Str. 26, 119334, Moscow, Russia
| | - Heike Wägele
- Centre for Molecular Biodiversity Research, Leibniz Institute for the Analysis of Biodiversity Change/ZFMK, Museum Koenig, Adenauerallee 160, 53113, Bonn, Germany
| | - Alexander Donath
- Centre for Molecular Biodiversity Research, Leibniz Institute for the Analysis of Biodiversity Change/ZFMK, Museum Koenig, Adenauerallee 160, 53113, Bonn, Germany.
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Yan L, Pape T, Meusemann K, Kutty SN, Meier R, Bayless KM, Zhang D. Monophyletic blowflies revealed by phylogenomics. BMC Biol 2021; 19:230. [PMID: 34706743 PMCID: PMC8555136 DOI: 10.1186/s12915-021-01156-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 09/23/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Blowflies are ubiquitous insects, often shiny and metallic, and the larvae of many species provide important ecosystem services (e.g., recycling carrion) and are used in forensics and debridement therapy. Yet, the taxon has repeatedly been recovered to be para- or polyphyletic, and the lack of a well-corroborated phylogeny has prevented a robust classification. RESULTS We here resolve the relationships between the different blowfly subclades by including all recognized subfamilies in a phylogenomic analysis using 2221 single-copy nuclear protein-coding genes of Diptera. Maximum likelihood (ML), maximum parsimony (MP), and coalescent-based phylogeny reconstructions all support the same relationships for the full data set. Based on this backbone phylogeny, blowflies are redefined as the most inclusive monophylum within the superfamily Oestroidea not containing Mesembrinellidae, Mystacinobiidae, Oestridae, Polleniidae, Sarcophagidae, Tachinidae, and Ulurumyiidae. The constituent subfamilies are re-classified as Ameniinae (including the Helicoboscinae, syn. nov.), Bengaliinae, Calliphorinae (including Aphyssurinae, syn. nov., Melanomyinae, syn. nov., and Toxotarsinae, syn. nov.), Chrysomyinae, Luciliinae, Phumosiinae, Rhiniinae stat. rev., and Rhinophorinae stat. rev. Metallic coloration in the adult is shown to be widespread but does not emerge as the most likely ground plan feature. CONCLUSIONS Our study provides the first phylogeny of oestroid calyptrates including all blowfly subfamilies. This allows settling a long-lasting controversy in Diptera by redefining blowflies as a well-supported monophylum, and blowfly classification is adjusted accordingly. The archetypical blowfly trait of carrion-feeding maggots most likely evolved twice, and the metallic color may not belong to the blowfly ground plan.
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Affiliation(s)
- Liping Yan
- School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China
| | - Thomas Pape
- Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark
| | - Karen Meusemann
- Evolutionary Biology & Ecology, University of Freiburg, Freiburg, Germany
- Zoologisches Forschungsmuseum Alexander Koenig (ZFMK)/Zentrum für Molekulare Biodiversitätsforschung (ZMB), Bonn, Germany
- Australian National Insect Collection, CSIRO National Research Collections Australia (NRCA), Canberra, Australia
| | - Sujatha Narayanan Kutty
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
- Tropical Marine Science Institute, National University of Singapore, Singapore, Singapore
| | - Rudolf Meier
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
- Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Center for Integrative Biodiversity Discovery, Berlin, Germany
| | - Keith M Bayless
- Australian National Insect Collection, CSIRO National Research Collections Australia (NRCA), Canberra, Australia
- Department of Entomology, California Academy of Sciences, San Francisco, USA
| | - Dong Zhang
- School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China.
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Tihelka E, Cai C, Giacomelli M, Lozano-Fernandez J, Rota-Stabelli O, Huang D, Engel MS, Donoghue PCJ, Pisani D. The evolution of insect biodiversity. Curr Biol 2021; 31:R1299-R1311. [PMID: 34637741 DOI: 10.1016/j.cub.2021.08.057] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Insects comprise over half of all described animal species. Together with the Protura (coneheads), Collembola (springtails) and Diplura (two-pronged bristletails), insects form the Hexapoda, a terrestrial arthropod lineage characterised by possessing six legs. Exponential growth of genome-scale data for the hexapods has substantially altered our understanding of the origin and evolution of insect biodiversity. Phylogenomics has provided a new framework for reconstructing insect evolutionary history, resolving their position among the arthropods and some long-standing internal controversies such as the placement of the termites, twisted-winged insects, lice and fleas. However, despite the greatly increased size of phylogenomic datasets, contentious relationships among key insect clades remain unresolved. Further advances in insect phylogeny cannot rely on increased depth and breadth of genome and taxon sequencing. Improved modelling of the substitution process is fundamental to countering tree-reconstruction artefacts, while gene content, modelling of duplications and deletions, and comparative morphology all provide complementary lines of evidence to test hypotheses emerging from the analysis of sequence data. Finally, the integration of molecular and morphological data is key to the incorporation of fossil species within insect phylogeny. The emerging integrated framework of insect evolution will help explain the origins of insect megadiversity in terms of the evolution of their body plan, species diversity and ecology. Future studies of insect phylogeny should build upon an experimental, hypothesis-driven approach where the robustness of hypotheses generated is tested against increasingly realistic evolutionary models as well as complementary sources of phylogenetic evidence.
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Affiliation(s)
- Erik Tihelka
- School of Earth Sciences, University of Bristol, Bristol, UK; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Centre for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, China.
| | - Chenyang Cai
- School of Earth Sciences, University of Bristol, Bristol, UK; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Centre for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, China.
| | | | - Jesus Lozano-Fernandez
- School of Biological Sciences, University of Bristol, Bristol, UK; Institute of Evolutionary Biology (CSIC-UPF), Barcelona, Spain
| | - Omar Rota-Stabelli
- Research and Innovation Centre, Fondazione Edmund Mach, 38010 San Michele all Adige, Italy; Center Agriculture Food Environment, University of Trento, 38010 San Michele all Adige, Italy
| | - Diying Huang
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Centre for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, China
| | - Michael S Engel
- Division of Entomology, Natural History Museum, University of Kansas, Lawrence, KS, USA; Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS, USA
| | | | - Davide Pisani
- School of Earth Sciences, University of Bristol, Bristol, UK; School of Biological Sciences, University of Bristol, Bristol, UK.
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Mayfly metamorphosis: Adult winged insects that molt. Proc Natl Acad Sci U S A 2021; 118:2114128118. [PMID: 34521757 DOI: 10.1073/pnas.2114128118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/20/2021] [Indexed: 11/18/2022] Open
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10
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Xu KK, Chen QP, Ayivi SPG, Guan JY, Storey KB, Yu DN, Zhang JY. Three Complete Mitochondrial Genomes of Orestes guangxiensis, Peruphasma schultei, and Phryganistria guangxiensis (Insecta: Phasmatodea) and Their Phylogeny. INSECTS 2021; 12:779. [PMID: 34564219 PMCID: PMC8471129 DOI: 10.3390/insects12090779] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/26/2021] [Accepted: 08/28/2021] [Indexed: 01/21/2023]
Abstract
Insects of the order Phasmatodea are mainly distributed in the tropics and subtropics and are best known for their remarkable camouflage as plants. In this study, we sequenced three complete mitochondrial genomes from three different families: Orestes guangxiensis, Peruphasma schultei, and Phryganistria guangxiensis. The lengths of the three mitochondrial genomes were 15,896 bp, 16,869 bp, and 17,005 bp, respectively, and the gene composition and structure of the three stick insects were identical to those of the most recent common ancestor of insects. The phylogenetic relationships among stick insects have been chaotic for a long time. In order to discuss the intra- and inter-ordinal relationship of Phasmatodea, we used the 13 protein-coding genes (PCGs) of 85 species for maximum likelihood (ML) and Bayesian inference (BI) analyses. Results showed that the internal topological structure of Phasmatodea had a few differences in both ML and BI trees and long-branch attraction (LBA) appeared between Embioptera and Zoraptera, which led to a non-monophyletic Phasmatodea. Consequently, after removal of the Embioptera and Zoraptera species, we re-performed ML and BI analyses with the remaining 81 species, which showed identical topology except for the position of Tectarchus ovobessus (Phasmatodea). We recovered the monophyly of Phasmatodea and the sister-group relationship between Phasmatodea and Mantophasmatodea. Our analyses also recovered the monophyly of Heteropterygidae and the paraphyly of Diapheromeridae, Phasmatidae, Lonchodidae, Lonchodinae, and Clitumninae. In this study, Peruphasma schultei (Pseudophasmatidae), Phraortes sp. YW-2014 (Lonchodidae), and species of Diapheromeridae clustered into the clade of Phasmatidae. Within Heteropterygidae, O. guangxiensis was the sister clade to O. mouhotii belonging to Dataminae, and the relationship of (Heteropteryginae + (Dataminae + Obriminae)) was recovered.
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Affiliation(s)
- Ke-Ke Xu
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; (K.-K.X.); (Q.-P.C.); (S.P.G.A.); (J.-Y.G.); (D.-N.Y.)
| | - Qing-Ping Chen
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; (K.-K.X.); (Q.-P.C.); (S.P.G.A.); (J.-Y.G.); (D.-N.Y.)
| | - Sam Pedro Galilee Ayivi
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; (K.-K.X.); (Q.-P.C.); (S.P.G.A.); (J.-Y.G.); (D.-N.Y.)
| | - Jia-Yin Guan
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; (K.-K.X.); (Q.-P.C.); (S.P.G.A.); (J.-Y.G.); (D.-N.Y.)
| | - Kenneth B. Storey
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada;
| | - Dan-Na Yu
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; (K.-K.X.); (Q.-P.C.); (S.P.G.A.); (J.-Y.G.); (D.-N.Y.)
- Key Lab of Wildlife Biotechnology, Conservation and Utilization of Zhejiang Province, Zhejiang Normal University, Jinhua 321004, China
| | - Jia-Yong Zhang
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China; (K.-K.X.); (Q.-P.C.); (S.P.G.A.); (J.-Y.G.); (D.-N.Y.)
- Key Lab of Wildlife Biotechnology, Conservation and Utilization of Zhejiang Province, Zhejiang Normal University, Jinhua 321004, China
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Mongiardino Koch N. Phylogenomic Subsampling and the Search for Phylogenetically Reliable Loci. Mol Biol Evol 2021; 38:4025-4038. [PMID: 33983409 DOI: 10.1101/2021.02.13.431075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023] Open
Abstract
Phylogenomic subsampling is a procedure by which small sets of loci are selected from large genome-scale data sets and used for phylogenetic inference. This step is often motivated by either computational limitations associated with the use of complex inference methods or as a means of testing the robustness of phylogenetic results by discarding loci that are deemed potentially misleading. Although many alternative methods of phylogenomic subsampling have been proposed, little effort has gone into comparing their behavior across different data sets. Here, I calculate multiple gene properties for a range of phylogenomic data sets spanning animal, fungal, and plant clades, uncovering a remarkable predictability in their patterns of covariance. I also show how these patterns provide a means for ordering loci by both their rate of evolution and their relative phylogenetic usefulness. This method of retrieving phylogenetically useful loci is found to be among the top performing when compared with alternative subsampling protocols. Relatively common approaches such as minimizing potential sources of systematic bias or increasing the clock-likeness of the data are found to fare worse than selecting loci at random. Likewise, the general utility of rate-based subsampling is found to be limited: loci evolving at both low and high rates are among the least effective, and even those evolving at optimal rates can still widely differ in usefulness. This study shows that many common subsampling approaches introduce unintended effects in off-target gene properties and proposes an alternative multivariate method that simultaneously optimizes phylogenetic signal while controlling for known sources of bias.
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Abstract
Phylogenomic subsampling is a procedure by which small sets of loci are selected from large genome-scale data sets and used for phylogenetic inference. This step is often motivated by either computational limitations associated with the use of complex inference methods or as a means of testing the robustness of phylogenetic results by discarding loci that are deemed potentially misleading. Although many alternative methods of phylogenomic subsampling have been proposed, little effort has gone into comparing their behavior across different data sets. Here, I calculate multiple gene properties for a range of phylogenomic data sets spanning animal, fungal, and plant clades, uncovering a remarkable predictability in their patterns of covariance. I also show how these patterns provide a means for ordering loci by both their rate of evolution and their relative phylogenetic usefulness. This method of retrieving phylogenetically useful loci is found to be among the top performing when compared with alternative subsampling protocols. Relatively common approaches such as minimizing potential sources of systematic bias or increasing the clock-likeness of the data are found to fare worse than selecting loci at random. Likewise, the general utility of rate-based subsampling is found to be limited: loci evolving at both low and high rates are among the least effective, and even those evolving at optimal rates can still widely differ in usefulness. This study shows that many common subsampling approaches introduce unintended effects in off-target gene properties and proposes an alternative multivariate method that simultaneously optimizes phylogenetic signal while controlling for known sources of bias.
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13
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Dittrich K, Wipfler B. A review of the hexapod tracheal system with a focus on the apterygote groups. ARTHROPOD STRUCTURE & DEVELOPMENT 2021; 63:101072. [PMID: 34098323 DOI: 10.1016/j.asd.2021.101072] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 05/07/2021] [Accepted: 05/11/2021] [Indexed: 06/12/2023]
Abstract
Respiratory systems are key innovations for the radiation of terrestrial arthropods. It is therefore surprising that there is still a considerable lack of knowledge. In this review of the available information on tracheal systems of hexapods (with a focus on the apterygote lineages Protura, Collembola, Diplura, Archaeognatha and Zygentoma), we summarize available data on the spiracles (number, position and morphology), the shape and variability of tracheal branching patterns including anastomoses, the tracheal fine structure and the respiratory proteins. The available data are strongly fragmented, and information for most subgroups is missing. In various cases, individual observations for one species account for the knowledge of the entire order. The available data show that there are strong differences between but also within apterygote orders. We conclude that the available data are insufficient to derive detailed conclusions on the hexapod ground plan and outline the possible evolutionary scenarios for the tracheal system in this group.
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Affiliation(s)
- Kathleen Dittrich
- Zoological Research Museum Alexander Koenig, Adenauerallee 160, 53113, Bonn, Germany.
| | - Benjamin Wipfler
- Zoological Research Museum Alexander Koenig, Adenauerallee 160, 53113, Bonn, Germany.
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14
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Rapid and efficient mating in mayflies (Ephemeroptera): morphological and reproductive strategies in primitive winged insects. Naturwissenschaften 2021; 108:10. [PMID: 33687535 DOI: 10.1007/s00114-021-01721-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 02/14/2021] [Accepted: 02/22/2021] [Indexed: 10/22/2022]
Abstract
Mayflies (order Ephemeroptera) are primitive winged insects with a life cycle of aquatic nymphal development until emergence as adults that briefly fly seeking mates. Mayflies have reproductive morphology and strategies promoting efficient copulation and oviposition during the ephemeral terrestrial phase. The anatomy of the reproductive tract in males and females of Thraulodes latinus (Leptophlebiidae) is described in relation to the reproductive behavior of Ephemeroptera. Males have a pair of testes that are degenerate in the preadult life stage (subimago) and a pair of deferent ducts that open directly into the gonopores, without ejaculatory duct and accessory glands that are common in other insects. Adult females have a pair of pectinate ovaries with many mature oocytes, a pair of lateral oviducts, and a common oviduct, but lack spermatheca for storage of sperm and associated glands as in most insects. During mating, the paired deferent ducts of males inject sperm directly into females' lateral oviducts, where mass fertilization occurs. Contraction of the intrinsic muscles of the male's deferent ducts directs and rapidly propels the flow of spermatozoa. Reproductive strategies, such as facultative parthenogenesis in mayflies and associated selective pressures involved in the morphology and reproductive behavior of these insects, are discussed.
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15
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Bayless KM, Trautwein MD, Meusemann K, Shin S, Petersen M, Donath A, Podsiadlowski L, Mayer C, Niehuis O, Peters RS, Meier R, Kutty SN, Liu S, Zhou X, Misof B, Yeates DK, Wiegmann BM. Beyond Drosophila: resolving the rapid radiation of schizophoran flies with phylotranscriptomics. BMC Biol 2021; 19:23. [PMID: 33557827 PMCID: PMC7871583 DOI: 10.1186/s12915-020-00944-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 12/17/2020] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND The most species-rich radiation of animal life in the 66 million years following the Cretaceous extinction event is that of schizophoran flies: a third of fly diversity including Drosophila fruit fly model organisms, house flies, forensic blow flies, agricultural pest flies, and many other well and poorly known true flies. Rapid diversification has hindered previous attempts to elucidate the phylogenetic relationships among major schizophoran clades. A robust phylogenetic hypothesis for the major lineages containing these 55,000 described species would be critical to understand the processes that contributed to the diversity of these flies. We use protein encoding sequence data from transcriptomes, including 3145 genes from 70 species, representing all superfamilies, to improve the resolution of this previously intractable phylogenetic challenge. RESULTS Our results support a paraphyletic acalyptrate grade including a monophyletic Calyptratae and the monophyly of half of the acalyptrate superfamilies. The primary branching framework of Schizophora is well supported for the first time, revealing the primarily parasitic Pipunculidae and Sciomyzoidea stat. rev. as successive sister groups to the remaining Schizophora. Ephydroidea, Drosophila's superfamily, is the sister group of Calyptratae. Sphaeroceroidea has modest support as the sister to all non-sciomyzoid Schizophora. We define two novel lineages corroborated by morphological traits, the 'Modified Oviscapt Clade' containing Tephritoidea, Nerioidea, and other families, and the 'Cleft Pedicel Clade' containing Calyptratae, Ephydroidea, and other families. Support values remain low among a challenging subset of lineages, including Diopsidae. The placement of these families remained uncertain in both concatenated maximum likelihood and multispecies coalescent approaches. Rogue taxon removal was effective in increasing support values compared with strategies that maximise gene coverage or minimise missing data. CONCLUSIONS Dividing most acalyptrate fly groups into four major lineages is supported consistently across analyses. Understanding the fundamental branching patterns of schizophoran flies provides a foundation for future comparative research on the genetics, ecology, and biocontrol.
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Affiliation(s)
- Keith M Bayless
- Australian National Insect Collection, CSIRO National Research Collections Australia (NRCA), Acton, Canberra, ACT, Australia.
- Department of Entomology, California Academy of Sciences, San Francisco, CA, USA.
- Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC, USA.
| | - Michelle D Trautwein
- Department of Entomology, California Academy of Sciences, San Francisco, CA, USA
| | - Karen Meusemann
- Australian National Insect Collection, CSIRO National Research Collections Australia (NRCA), Acton, Canberra, ACT, Australia
- Centre for Molecular Biodiversity Research (ZMB), Zoologisches Forschungsmuseum Alexander Koenig (ZFMK), Bonn, Germany
- Department of Evolutionary Biology & Ecology, Institute of Biology I, Albert Ludwig University of Freiburg, Hauptstraße 1, Freiburg i. Br., Germany
| | - Seunggwan Shin
- Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC, USA
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Malte Petersen
- Max-Planck-Institut of Immunobiology and Epigenetics, Freiburg, Germany
| | - Alexander Donath
- Centre for Molecular Biodiversity Research (ZMB), Zoologisches Forschungsmuseum Alexander Koenig (ZFMK), Bonn, Germany
| | - Lars Podsiadlowski
- Centre for Molecular Biodiversity Research (ZMB), Zoologisches Forschungsmuseum Alexander Koenig (ZFMK), Bonn, Germany
| | - Christoph Mayer
- Centre for Molecular Biodiversity Research (ZMB), Zoologisches Forschungsmuseum Alexander Koenig (ZFMK), Bonn, Germany
| | - Oliver Niehuis
- Department of Evolutionary Biology & Ecology, Institute of Biology I, Albert Ludwig University of Freiburg, Hauptstraße 1, Freiburg i. Br., Germany
| | - Ralph S Peters
- Centre of Taxonomy and Evolutionary Research, Arthropoda Department, Zoological Research Museum Alexander Koenig, Bonn, Germany
| | - Rudolf Meier
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
- Lee Kong Chian Natural History Museum, National University of Singapore, Singapore, Singapore
| | - Sujatha Narayanan Kutty
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
- Tropical Marine Science Institute, National University of Singapore, Singapore, Singapore
| | - Shanlin Liu
- Department of Entomology, China Agricultural University, Beijing, People's Republic of China
| | - Xin Zhou
- Department of Entomology, China Agricultural University, Beijing, People's Republic of China
| | - Bernhard Misof
- Zoological Research Museum Alexander Koenig (ZFMK), Bonn, Germany
| | - David K Yeates
- Australian National Insect Collection, CSIRO National Research Collections Australia (NRCA), Acton, Canberra, ACT, Australia
| | - Brian M Wiegmann
- Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC, USA
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16
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Schoville SD, Simon S, Bai M, Beethem Z, Dudko RY, Eberhard MJB, Frandsen PB, Küpper SC, Machida R, Verheij M, Willadsen PC, Zhou X, Wipfler B. Comparative transcriptomics of ice-crawlers demonstrates cold specialization constrains niche evolution in a relict lineage. Evol Appl 2021; 14:360-382. [PMID: 33664782 PMCID: PMC7896716 DOI: 10.1111/eva.13120] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/25/2020] [Accepted: 08/17/2020] [Indexed: 12/26/2022] Open
Abstract
Key changes in ecological niche space are often critical to understanding how lineages diversify during adaptive radiations. However, the converse, or understanding why some lineages are depauperate and relictual, is more challenging, as many factors may constrain niche evolution. In the case of the insect order Grylloblattodea, highly conserved thermal breadth is assumed to be closely tied to their relictual status, but has not been formerly tested. Here, we investigate whether evolutionary constraints in the physiological tolerance of temperature can help explain relictualism in this lineage. Using a comparative transcriptomics approach, we investigate gene expression following acute heat and cold stress across members of Grylloblattodea and their sister group, Mantophasmatodea. We additionally examine patterns of protein evolution, to identify candidate genes of positive selection. We demonstrate that cold specialization in Grylloblattodea has been accompanied by the loss of the inducible heat shock response under both acute heat and cold stress. Additionally, there is widespread evidence of selection on protein-coding genes consistent with evolutionary constraints due to cold specialization. This includes positive selection on genes involved in trehalose transport, metabolic function, mitochondrial function, oxygen reduction, oxidative stress, and protein synthesis. These patterns of molecular adaptation suggest that Grylloblattodea have undergone evolutionary trade-offs to survive in cold habitats and should be considered highly vulnerable to climate change. Finally, our transcriptomic data provide a robust backbone phylogeny for generic relationships within Grylloblattodea and Mantophasmatodea. Major phylogenetic splits in each group relate to arid conditions driving biogeographical patterns, with support for a sister-group relationship between North American Grylloblatta and Altai-Sayan Grylloblattella, and a range disjunction in Namibia splitting major clades within Mantophasmatodea.
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Affiliation(s)
| | - Sabrina Simon
- Biosystematics GroupWageningen University & ResearchPB WageningenThe Netherlands
| | - Ming Bai
- Key Laboratory of Zoological Systematics and EvolutionInstitute of ZoologyChinese Academy of SciencesBeijingChina
| | - Zachary Beethem
- Department of EntomologyUniversity of Wisconsin‐MadisonMadisonWIUSA
- Present address:
Department of Biomedical SciencesSchool of Veterinary MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Roman Y. Dudko
- Institute of Systematics and Ecology of AnimalsSiberian Branch of the Russian Academy of SciencesNovosibirskRussia
- Tomsk State UniversityTomskRussia
| | - Monika J. B. Eberhard
- Zoological Institute and MuseumGeneral Zoology and Zoological SystematicsUniversity of GreifswaldGreifswaldGermany
| | - Paul B. Frandsen
- Department of Plant & Wildlife SciencesBrigham Young UniversityProvoUTUSA
- Data Science LabOffice of the Chief Information OfficerSmithsonian InstitutionWashingtonDCU.S.A
| | - Simon C. Küpper
- Zoological Institute and MuseumGeneral Zoology and Zoological SystematicsUniversity of GreifswaldGreifswaldGermany
| | - Ryuichiro Machida
- Sugadaira Research StationMountain Science CenterUniversity of TsukubaUeda, NaganoJapan
| | - Max Verheij
- Biosystematics GroupWageningen University & ResearchPB WageningenThe Netherlands
| | - Peter C. Willadsen
- Department of EntomologyUniversity of Wisconsin‐MadisonMadisonWIUSA
- Present address:
Department of Entomology and Plant PathologyNorth Carolina State UniversityCampus Box 7613RaleighNCUSA
| | - Xin Zhou
- Department of EntomologyCollege of Plant ProtectionChina Agricultural UniversityBeijingChina
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17
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Szucsich NU, Bartel D, Blanke A, Böhm A, Donath A, Fukui M, Grove S, Liu S, Macek O, Machida R, Misof B, Nakagaki Y, Podsiadlowski L, Sekiya K, Tomizuka S, Von Reumont BM, Waterhouse RM, Walzl M, Meng G, Zhou X, Pass G, Meusemann K. Four myriapod relatives - but who are sisters? No end to debates on relationships among the four major myriapod subgroups. BMC Evol Biol 2020; 20:144. [PMID: 33148176 PMCID: PMC7640414 DOI: 10.1186/s12862-020-01699-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 09/30/2020] [Indexed: 11/20/2022] Open
Abstract
Background Phylogenetic relationships among the myriapod subgroups Chilopoda, Diplopoda, Symphyla and Pauropoda are still not robustly resolved. The first phylogenomic study covering all subgroups resolved phylogenetic relationships congruently to morphological evidence but is in conflict with most previously published phylogenetic trees based on diverse molecular data. Outgroup choice and long-branch attraction effects were stated as possible explanations for these incongruencies. In this study, we addressed these issues by extending the myriapod and outgroup taxon sampling using transcriptome data. Results We generated new transcriptome data of 42 panarthropod species, including all four myriapod subgroups and additional outgroup taxa. Our taxon sampling was complemented by published transcriptome and genome data resulting in a supermatrix covering 59 species. We compiled two data sets, the first with a full coverage of genes per species (292 single-copy protein-coding genes), the second with a less stringent coverage (988 genes). We inferred phylogenetic relationships among myriapods using different data types, tree inference, and quartet computation approaches. Our results unambiguously support monophyletic Mandibulata and Myriapoda. Our analyses clearly showed that there is strong signal for a single unrooted topology, but a sensitivity of the position of the internal root on the choice of outgroups. However, we observe strong evidence for a clade Pauropoda+Symphyla, as well as for a clade Chilopoda+Diplopoda. Conclusions Our best quartet topology is incongruent with current morphological phylogenies which were supported in another phylogenomic study. AU tests and quartet mapping reject the quartet topology congruent to trees inferred with morphological characters. Moreover, quartet mapping shows that confounding signal present in the data set is sufficient to explain the weak signal for the quartet topology derived from morphological characters. Although outgroup choice affects results, our study could narrow possible trees to derivatives of a single quartet topology. For highly disputed relationships, we propose to apply a series of tests (AU and quartet mapping), since results of such tests allow to narrow down possible relationships and to rule out confounding signal.
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Affiliation(s)
- Nikolaus U Szucsich
- Department of Evolutionary Biology, University of Vienna, A-1090, Vienna, Austria. .,Central Research Laboratories, Natural History Museum of Vienna, A-1010, Vienna, Austria.
| | - Daniela Bartel
- Department of Evolutionary Biology, University of Vienna, A-1090, Vienna, Austria
| | - Alexander Blanke
- Institute for Zoology, Biocenter, University of Cologne, D-50674, Cologne, Germany.,Institute of Evolutionary Biology and Animal Ecology, University of Bonn, D-53121, Bonn, Germany
| | - Alexander Böhm
- Department of Evolutionary Biology, University of Vienna, A-1090, Vienna, Austria
| | - Alexander Donath
- Centre for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, D-53113, Bonn, Germany
| | - Makiko Fukui
- Department of Biology, Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
| | - Simon Grove
- Invertebrate Zoology, Collections and Research Facility, Tasmanian Museum and Art Gallery, Rosny, Tasmania, 7018, Australia
| | - Shanlin Liu
- Department of Entomology, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Oliver Macek
- Department of Evolutionary Biology, University of Vienna, A-1090, Vienna, Austria.,Central Research Laboratories, Natural History Museum of Vienna, A-1010, Vienna, Austria
| | - Ryuichiro Machida
- Sugadaira Research Station, Mountain Science Center, University of Tsukuba, Sugadaira, Ueda, Nagano, 386-2204, Japan
| | - Bernhard Misof
- Zoological Research Museum Alexander Koenig, D-53113, Bonn, Germany
| | - Yasutaka Nakagaki
- Sugadaira Research Station, Mountain Science Center, University of Tsukuba, Sugadaira, Ueda, Nagano, 386-2204, Japan
| | - Lars Podsiadlowski
- Centre for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, D-53113, Bonn, Germany
| | - Kaoru Sekiya
- Sugadaira Research Station, Mountain Science Center, University of Tsukuba, Sugadaira, Ueda, Nagano, 386-2204, Japan
| | | | - Björn M Von Reumont
- LOEWE Centre for Translational Biodiversity Genomics (LOEWE TBG), Senckenberganlage 25, 60325, Frankfurt, Germany.,Animal Venomics, Institute for Insect Biotechnology, University of Giessen, Heinrich Buff Ring 26-32, D-35394, Giessen, Germany
| | - Robert M Waterhouse
- Department of Ecology and Evolution, University of Lausanne and Swiss Institute of Bioinformatics, 1015, Lausanne, Switzerland
| | - Manfred Walzl
- Department of Evolutionary Biology, University of Vienna, A-1090, Vienna, Austria
| | - Guanliang Meng
- Centre of Taxonomy and Evolutionary Research, Zoological Research Museum Alexander Koenig, D-53113, Bonn, Germany
| | - Xin Zhou
- Department of Entomology, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Günther Pass
- Department of Evolutionary Biology, University of Vienna, A-1090, Vienna, Austria
| | - Karen Meusemann
- Centre for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, D-53113, Bonn, Germany. .,Department of Evolutionary Biology and Ecology, Institute of Biology I (Zoology), University of Freiburg, D-79104, Freiburg, Germany. .,Australian National Insect Collection, National Research Collections Australia, CSIRO, ACT, Canberra, 2601, Australia.
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18
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de Moya RS, Yoshizawa K, Walden KKO, Sweet AD, Dietrich CH, Kevin P J. Phylogenomics of Parasitic and Nonparasitic Lice (Insecta: Psocodea): Combining Sequence Data and Exploring Compositional Bias Solutions in Next Generation Data Sets. Syst Biol 2020; 70:719-738. [PMID: 32979270 DOI: 10.1093/sysbio/syaa075] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 11/13/2022] Open
Abstract
The insect order Psocodea is a diverse lineage comprising both parasitic (Phthiraptera) and nonparasitic members (Psocoptera). The extreme age and ecological diversity of the group may be associated with major genomic changes, such as base compositional biases expected to affect phylogenetic inference. Divergent morphology between parasitic and nonparasitic members has also obscured the origins of parasitism within the order. We conducted a phylogenomic analysis on the order Psocodea utilizing both transcriptome and genome sequencing to obtain a data set of 2370 orthologous genes. All phylogenomic analyses, including both concatenated and coalescent methods suggest a single origin of parasitism within the order Psocodea, resolving conflicting results from previous studies. This phylogeny allows us to propose a stable ordinal level classification scheme that retains significant taxonomic names present in historical scientific literature and reflects the evolution of the group as a whole. A dating analysis, with internal nodes calibrated by fossil evidence, suggests an origin of parasitism that predates the K-Pg boundary. Nucleotide compositional biases are detected in third and first codon positions and result in the anomalous placement of the Amphientometae as sister to Psocomorpha when all nucleotide sites are analyzed. Likelihood-mapping and quartet sampling methods demonstrate that base compositional biases can also have an effect on quartet-based methods.[Illumina; Phthiraptera; Psocoptera; quartet sampling; recoding methods.].
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Affiliation(s)
- Robert S de Moya
- Department of Entomology, University of Illinois Urbana-Champaign, 505 S. Goodwin Ave., Urbana, IL 61801, USA.,Illinois Natural History Survey, Prairie Research Institute, University of Illinois, Champaign, IL 61820, USA
| | - Kazunori Yoshizawa
- Systematic Entomology, School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
| | - Kimberly K O Walden
- Department of Entomology, University of Illinois Urbana-Champaign, 505 S. Goodwin Ave., Urbana, IL 61801, USA
| | - Andrew D Sweet
- Department of Entomology, Purdue University, 901 W. State St., West Lafayette, IN 47907, USA
| | - Christopher H Dietrich
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois, Champaign, IL 61820, USA
| | - Johnson Kevin P
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois, Champaign, IL 61820, USA
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19
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Prokop J, Pecharová M, Sinitshenkova ND, Klass KD. Male postabdomen reveals ancestral traits of Megasecoptera among winged insects. ARTHROPOD STRUCTURE & DEVELOPMENT 2020; 57:100944. [PMID: 32361571 DOI: 10.1016/j.asd.2020.100944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/02/2020] [Accepted: 04/03/2020] [Indexed: 06/11/2023]
Abstract
External male genitalia of insects are greatly diverse in form and frequently used in evolutionary context and taxonomy. Therefore, our proper recognition of homologous structures among various groups from Paleozoic and extant insect taxa is of crucial interest, allowing to understand the key steps in insect evolution. Here, we reveal structural details of two Late Carboniferous representatives of Megasecoptera (families Bardohymenidae and Brodiopteridae), such as the presence of separated coxal plates VIII and ventral expansions of coxal lobes IX. Together with the confirmed presence of abdominal styli in some other members of Palaeodictyopterida (Diaphanopterodea) this suggests that early pterygotes may have had traits more archaic than expected. Whether or not these traits point to a stem-group relationship of Palaeodictyopterida to all other Pterygota as suspected by earlier authors remains unclear at this stage. Furthermore, the present study provides an updated comparison of male postabdomen morphology among extant species of wingless Archaeognatha and representatives of early diverging groups of Pterygota from the Late Carboniferous and Early Permian, the Megasecoptera (Palaeodictyopterida), Permoplectoptera (Ephemeroptera) and Meganisoptera (Odonatoptera).
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Affiliation(s)
- Jakub Prokop
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ 128 00, Praha 2, Czech Republic.
| | - Martina Pecharová
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ 128 00, Praha 2, Czech Republic
| | - Nina D Sinitshenkova
- Palaeontological Institute of the Russian Academy of Sciences, Profsoyuznaya 123, Moscow, Russia
| | - Klaus-Dieter Klass
- Senckenberg Natural History Collections Dresden, Museum of Zoology, Königsbrücker Landstrasse 159, 01109 Dresden, Germany
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20
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Cai C, Tihelka E, Pisani D, Donoghue PCJ. Data curation and modeling of compositional heterogeneity in insect phylogenomics: A case study of the phylogeny of Dytiscoidea (Coleoptera: Adephaga). Mol Phylogenet Evol 2020; 147:106782. [PMID: 32147574 DOI: 10.1016/j.ympev.2020.106782] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 02/26/2020] [Indexed: 10/24/2022]
Abstract
Diving beetles and their allies are an almost ubiquitous group of freshwater predators. Knowledge of the phylogeny of the adephagan superfamily Dytiscoidea has significantly improved since the advent of molecular phylogenetics. However, despite recent comprehensive phylogenomic studies, some phylogenetic relationships among the constituent families remain elusive. In particular, the position of the family Hygrobiidae remains uncertain. We address these issues by re-analyzing recently published phylogenomic datasets for Dytiscoidea, using approaches to reduce compositional heterogeneity and adopting a site-heterogeneous mixture model. We obtained a consistent, well-resolved, and strongly supported tree. Consistent with previous studies, our analyses support Aspidytidae as the monophyletic sister group of Amphizoidae, and more importantly, Hygrobiidae as the sister of the diverse Dytiscidae, in agreement with morphology-based phylogenies. Our analyses provide a backbone phylogeny of Dytiscoidea, which lays the foundation for better understanding the evolution of morphological characters, life habits, and feeding behaviors of dytiscoid beetles.
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Affiliation(s)
- Chenyang Cai
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Centre for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China; School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK.
| | - Erik Tihelka
- Department of Animal Science, Hartpury College, Hartpury GL19 3BE, UK
| | - Davide Pisani
- School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK; School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK
| | - Philip C J Donoghue
- School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK.
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21
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Johnson KP. Putting the genome in insect phylogenomics. CURRENT OPINION IN INSECT SCIENCE 2019; 36:111-117. [PMID: 31546095 DOI: 10.1016/j.cois.2019.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 07/02/2019] [Accepted: 08/07/2019] [Indexed: 06/10/2023]
Abstract
Next-generation sequencing technologies provide a substantial increase in the size of molecular phylogenetic datasets that can be obtained for studies of insect systematics. Several new genome reduction approaches are leveraging these technologies to generate large phylogenomic datasets: targeted amplicon sequencing, target capture, and transcriptome sequencing. Although cost effective, these approaches provide limited data for questions outside of phylogenetics. For many groups of insects, sequencing the entire genome at modest coverage is feasible. Using these genomic reads, an automated Target Restricted Assembly Method (aTRAM) can use the results of blast searches to assemble thousands of single copy ortholog genes across a group of interest. These locally assembled genes can then be compiled into very large phylogenomic datasets. These genomic libraries have the advantage in that they also contain reads from the mitochondrial genome and symbiont genomes, as well the entire insect genome, and can be leveraged for additional studies beyond phylogenetics.
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Affiliation(s)
- Kevin P Johnson
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois, 1816 South Oak Street, Champaign, IL 61820 USA.
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22
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Simon S, Letsch H, Bank S, Buckley TR, Donath A, Liu S, Machida R, Meusemann K, Misof B, Podsiadlowski L, Zhou X, Wipfler B, Bradler S. Old World and New World Phasmatodea: Phylogenomics Resolve the Evolutionary History of Stick and Leaf Insects. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00345] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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23
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Miller SW, Movsesyan A, Zhang S, Fernández R, Posakony JW. Evolutionary emergence of Hairless as a novel component of the Notch signaling pathway. eLife 2019; 8:48115. [PMID: 31545167 PMCID: PMC6777938 DOI: 10.7554/elife.48115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 09/23/2019] [Indexed: 11/30/2022] Open
Abstract
Suppressor of Hairless [Su(H)], the transcription factor at the end of the Notch pathway in Drosophila, utilizes the Hairless protein to recruit two co-repressors, Groucho (Gro) and C-terminal Binding Protein (CtBP), indirectly. Hairless is present only in the Pancrustacea, raising the question of how Su(H) in other protostomes gains repressive function. We show that Su(H) from a wide array of arthropods, molluscs, and annelids includes motifs that directly bind Gro and CtBP; thus, direct co-repressor recruitment is ancestral in the protostomes. How did Hairless come to replace this ancestral paradigm? Our discovery of a protein (S-CAP) in Myriapods and Chelicerates that contains a motif similar to the Su(H)-binding domain in Hairless has revealed a likely evolutionary connection between Hairless and Metastasis-associated (MTA) protein, a component of the NuRD complex. Sequence comparison and widely conserved microsynteny suggest that S-CAP and Hairless arose from a tandem duplication of an ancestral MTA gene.
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Affiliation(s)
- Steven W Miller
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, United States
| | - Artem Movsesyan
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, United States
| | - Sui Zhang
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, United States
| | - Rosa Fernández
- Bioinformatics and Genomics Unit, Center for Genomic Regulation, Barcelona, Spain
| | - James W Posakony
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, United States
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Prokop J, Krzemińska E, Krzemiński W, Rosová K, Pecharová M, Nel A, Engel MS. Ecomorphological diversification of the Late Palaeozoic Palaeodictyopterida reveals different larval strategies and amphibious lifestyle in adults. ROYAL SOCIETY OPEN SCIENCE 2019; 6:190460. [PMID: 31598291 PMCID: PMC6774989 DOI: 10.1098/rsos.190460] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
The Late Palaeozoic insect superorder Palaeodictyopterida exhibits a remarkable disparity of larval ecomorphotypes, enabling these animals to occupy diverse ecological niches. The widely accepted hypothesis presumed that their immature stages only occupied terrestrial habitats, although authors more than a century ago hypothesized they had specializations for amphibious or even aquatic life histories. Here, we show that different species had a disparity of semiaquatic or aquatic specializations in larvae and even the supposed retention of abdominal tracheal gills by some adults. While a majority of mature larvae in Palaeodictyoptera lack unambiguous lateral tracheal gills, some recently discovered early instars had terminal appendages with prominent lateral lamellae like in living damselflies, allowing support in locomotion along with respiratory function. These results demonstrate that some species of Palaeodictyopterida had aquatic or semiaquatic larvae during at least a brief period of their post-embryonic development. The retention of functional gills or gill sockets by adults indicates their amphibious lifestyle and habitats tightly connected with a water environment as is analogously known for some modern Ephemeroptera or Plecoptera. Our study refutes an entirely terrestrial lifestyle for all representatives of the early diverging pterygote group of Palaeodictyopterida, a greatly varied and diverse lineage which probably encompassed many different biologies and life histories.
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Affiliation(s)
- Jakub Prokop
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ-128 00, Praha 2, Czech Republic
| | - Ewa Krzemińska
- Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, ul. Sławkowska 17, 31-016 Kraków, Poland
| | - Wiesław Krzemiński
- Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, ul. Sławkowska 17, 31-016 Kraków, Poland
| | - Kateřina Rosová
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ-128 00, Praha 2, Czech Republic
| | - Martina Pecharová
- Department of Zoology, Faculty of Science, Charles University, Viničná 7, CZ-128 00, Praha 2, Czech Republic
| | - André Nel
- Institut de Systématique, Évolution, Biodiversité, ISYEB - UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d'Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie 75005, Paris, France
| | - Michael S. Engel
- Division of Entomology, Natural History Museum, and Department of Ecology and Evolutionary Biology, University of Kansas, 1501 Crestline Drive – Suite 140, Lawrence, KS 66045, USA
- Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA
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Jacobus LM, Macadam CR, Sartori M. Mayflies (Ephemeroptera) and Their Contributions to Ecosystem Services. INSECTS 2019; 10:E170. [PMID: 31207933 PMCID: PMC6628430 DOI: 10.3390/insects10060170] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 06/03/2019] [Accepted: 06/06/2019] [Indexed: 11/16/2022]
Abstract
This work is intended as a general and concise overview of Ephemeroptera biology, diversity, and services provided to humans and other parts of our global array of freshwater and terrestrial ecosystems. The Ephemeroptera, or mayflies, are a small but diverse order of amphinotic insects associated with liquid freshwater worldwide. They are nearly cosmopolitan, except for Antarctica and some very remote islands. The existence of the subimago stage is unique among extant insects. Though the winged stages do not have functional mouthparts or digestive systems, the larval, or nymphal, stages have a variety of feeding approaches-including, but not limited to, collector-gatherers, filterers, scrapers, and active predators-with each supported by a diversity of morphological and behavioral adaptations. Mayflies provide direct and indirect services to humans and other parts of both freshwater and terrestrial ecosystems. In terms of cultural services, they have provided inspiration to musicians, poets, and other writers, as well as being the namesakes of various water- and aircraft. They are commemorated by festivals worldwide. Mayflies are especially important to fishing. Mayflies contribute to the provisioning services of ecosystems in that they are utilized as food by human cultures worldwide (having one of the highest protein contents of any edible insect), as laboratory organisms, and as a potential source of antitumor molecules. They provide regulatory services through their cleaning of freshwater. They provide many essential supporting services for ecosystems such as bioturbation, bioirrigation, decomposition, nutrition for many kinds of non-human animals, nutrient cycling and spiraling in freshwaters, nutrient cycling between aquatic and terrestrial systems, habitat for other organisms, and serving as indicators of ecosystem health. About 20% of mayfly species worldwide might have a threatened conservation status due to influences from pollution, invasive alien species, habitat loss and degradation, and climate change. Even mitigation of negative influences has benefits and tradeoffs, as, in several cases, sustainable energy production negatively impacts mayflies.
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Affiliation(s)
- Luke M Jacobus
- Division of Science, Indiana University Purdue University Columbus, 4601 Central Ave., Columbus, IN 47203, USA.
| | - Craig R Macadam
- Buglife-The Invertebrate Conservation Trust, Balallan House, 24 Allan Park, Stirling, Scotland FK8 2QG, UK.
| | - Michel Sartori
- Musée cantonal de zoologie, Palais de Rumine, Place de la Riponne 6, CH-1005 Lausanne, Switzerland.
- Department of Ecology and Evolution, University of Lausanne, Biophore, CH-1015 Lausanne, Switzerland.
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Almudi I, Martín-Blanco CA, García-Fernandez IM, López-Catalina A, Davie K, Aerts S, Casares F. Establishment of the mayfly Cloeon dipterum as a new model system to investigate insect evolution. EvoDevo 2019; 10:6. [PMID: 30984364 PMCID: PMC6446309 DOI: 10.1186/s13227-019-0120-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 03/21/2019] [Indexed: 02/07/2023] Open
Abstract
The great capability of insects to adapt to new environments promoted their extraordinary diversification, resulting in the group of Metazoa with the largest number of species distributed worldwide. To understand this enormous diversity, it is essential to investigate lineages that would allow the reconstruction of the early events in the evolution of insects. However, research on insect ecology, physiology, development and evolution has mostly focused on few well-established model species. The key phylogenetic position of mayflies within Paleoptera as the sister group of the rest of winged insects and life history traits of mayflies make them an essential order to understand insect evolution. Here, we describe the establishment of a continuous culture system of the mayfly Cloeon dipterum and a series of experimental protocols and omics resources that allow the study of its development and its great regenerative capability. Thus, the establishment of Cloeon as an experimental platform paves the way to understand genomic and morphogenetic events that occurred at the origin of winged insects.
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Affiliation(s)
- Isabel Almudi
- 1GEM-DMC2 Unit, The CABD (CSIC-UPO-JA), Ctra. de Utrera km 1, 41013 Seville, Spain
| | | | | | | | - Kristofer Davie
- Laboratory of Computational Biology, VIB Center for Brain & Disease Research, Herestraat 49, 3000 Louvain, Belgium.,3Department of Human Genetics, KU Leuven, Oude Markt 13, 3000 Louvain, Belgium
| | - Stein Aerts
- Laboratory of Computational Biology, VIB Center for Brain & Disease Research, Herestraat 49, 3000 Louvain, Belgium.,3Department of Human Genetics, KU Leuven, Oude Markt 13, 3000 Louvain, Belgium
| | - Fernando Casares
- 1GEM-DMC2 Unit, The CABD (CSIC-UPO-JA), Ctra. de Utrera km 1, 41013 Seville, Spain
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27
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Kusy D, Motyka M, Bocek M, Vogler AP, Bocak L. Genome sequences identify three families of Coleoptera as morphologically derived click beetles (Elateridae). Sci Rep 2018; 8:17084. [PMID: 30459416 PMCID: PMC6244081 DOI: 10.1038/s41598-018-35328-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 10/30/2018] [Indexed: 11/22/2022] Open
Abstract
Plastoceridae Crowson, 1972, Drilidae Blanchard, 1845 and Omalisidae Lacordaire, 1857 (Elateroidea) are families of the Coleoptera with obscure phylogenetic relationships and modified morphology showing neotenic traits such as soft bodies, reduced wing cases and larviform females. We shotgun sequenced genomes of Plastocerus, Drilus and Omalisus and incorporated them into data matrices of 66 and 4202 single-copy nuclear genes representing Elateroidea. Phylogenetic analyses indicate their terminal positions within the broadly defined well-sclerotized and fully metamorphosed Elateridae and thus Omalisidae should now be considered as Omalisinae stat. nov. in Elateridae Leach, 1815. The results support multiple independent origins of incomplete metamorphosis in Elateridae and indicate the parallel evolution of morphological and ecological traits. Unlike other neotenic elateroids derived from the supposedly pre-adapted aposematically coloured and unpalatable soft-bodied elateroids, such as fireflies (Lampyridae) and net-winged beetles (Lycidae), omalisids and drilids evolved from well-sclerotized click beetles. These findings suggest sudden morphological shifts through incomplete metamorphosis, with important implications for macroevolution, including reduced speciation rate and high extinction risk in unstable habitats. Precise phylogenetic placement is necessary for studies of the molecular mechanisms of ontogenetic shifts leading to profoundly changed morphology.
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Affiliation(s)
- Dominik Kusy
- Laboratory of Molecular Systematics, Department of Zoology, Faculty of Science, Palacky University, 17. listopadu 50, 771 46, Olomouc, Czech Republic
| | - Michal Motyka
- Laboratory of Molecular Systematics, Department of Zoology, Faculty of Science, Palacky University, 17. listopadu 50, 771 46, Olomouc, Czech Republic
| | - Matej Bocek
- Laboratory of Molecular Systematics, Department of Zoology, Faculty of Science, Palacky University, 17. listopadu 50, 771 46, Olomouc, Czech Republic
| | - Alfried P Vogler
- Department of Life Science, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
- Department of Life Science, Silwood Park Campus, Imperial College London Ascot, London, SL5 7BD, UK
| | - Ladislav Bocak
- Laboratory of Molecular Systematics, Department of Zoology, Faculty of Science, Palacky University, 17. listopadu 50, 771 46, Olomouc, Czech Republic.
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Boudinot BE. A general theory of genital homologies for the Hexapoda (Pancrustacea) derived from skeletomuscular correspondences, with emphasis on the Endopterygota. ARTHROPOD STRUCTURE & DEVELOPMENT 2018; 47:563-613. [PMID: 30419291 DOI: 10.1016/j.asd.2018.11.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 10/16/2018] [Accepted: 11/03/2018] [Indexed: 06/09/2023]
Abstract
No consensus exists for the homology and terminology of the male genitalia of the Hexapoda despite over a century of debate. Based on dissections and the literature, genital skeletomusculature was compared across the Hexapoda and contrasted with the Remipedia, the closest pancrustacean outgroup. The pattern of origin and insertion for extrinsic and intrinsic genitalic musculature was found to be consistent among the Ectognatha, Protura, and the Remipedia, allowing for the inference of homologies given recent phylogenomic studies. The penis of the Hexapoda is inferred to be derived from medially-fused primary gonopods (gonopore-bearing limbs), while the genitalia of the Ectognatha are inferred to include both the tenth-segmental penis and the ninth-segmental secondary gonopods, similar to the genitalia of female insects which comprise gonopods of the eighth and ninth segments. A new nomenclatural system for hexapodan genitalic musculature is presented and applied, and a general list of anatomical concepts is provided. Novel and refined homologies are proposed for all hexapodan orders, and a series of groundplans are postulated. Emphasis is placed on the Endopterygota, for which fine-grained transition series are hypothesized given observed skeletomuscular correspondences.
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Affiliation(s)
- Brendon E Boudinot
- Department of Entomology & Nematology, University of California, Davis, One Shields Ave., Davis, CA 95616, USA.
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