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Lasley RM, Evans N, Paulay G, Michonneau F, Windsor A, Irwansyah, Ng PKL. Allopatric mosaics in the Indo-West Pacific crab subfamily Chlorodiellinae reveal correlated patterns of sympatry, genetic divergence, and genitalic disparity. Mol Phylogenet Evol 2023; 181:107710. [PMID: 36707010 DOI: 10.1016/j.ympev.2023.107710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/31/2022] [Accepted: 01/18/2023] [Indexed: 01/26/2023]
Abstract
Molecular studies have revealed that many species once thought to be wide-ranging in the Indo-West Pacific contain allopatric mosaics of endemic lineages. These lineages provide compelling evidence that substantial time is needed to evolve isolating mechanisms sufficient to permit successful secondary sympatry, and that divergence is initiated in allopatry. In this context, questions arise regarding the nature, timing, and origin of isolating mechanisms that permit secondary sympatry. We present a phylogeny of the crab subfamily Chlorodiellinae which displays allopatric mosaics within species. These allopatric lineages typically do not have divergent male genitalia, while older sympatric lineages do. We tested the relationship between genetic distance (proxy for time), sympatry, and the divergence of male genitalic morphology. Our results suggest that male genitalic divergence is not involved in the initiation of speciation in chlorodielline crabs, having likely occurred only after isolation began in allopatry. However, morphological evolution of genitalia seemingly does play an important role in completing the process of speciation in these crabs.
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Affiliation(s)
- Robert M Lasley
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA; University of Guam, EPSCoR, Mangilao 96926, Guam; National Museum of Natural History, Smithsonian Institution, Suitland, MD 20746, USA.
| | - Nathaniel Evans
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA; National Museum of Natural History, Smithsonian Institution, Suitland, MD 20746, USA; Tropical Biosphere Research Center, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
| | - Gustav Paulay
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA
| | - Francois Michonneau
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA
| | - Amanda Windsor
- National Museum of Natural History, Smithsonian Institution, Suitland, MD 20746, USA
| | - Irwansyah
- Syiah Kuala University, Aceh 23111, Indonesia
| | - Peter K L Ng
- Lee Kong Chian Natural History Museum, National University of Singapore, 117377, Singapore
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