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Bojko J, Clark KF, Stewart-Clark S, Stentiford GD. Panopeispora mellora n. gen. n. sp. (microsporidia) infecting Say's crab (Dyspanopeus sayi) from the Atlantic shoreline of Canada. J Invertebr Pathol 2021; 184:107652. [PMID: 34358554 DOI: 10.1016/j.jip.2021.107652] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 07/26/2021] [Accepted: 07/29/2021] [Indexed: 11/22/2022]
Abstract
Say's mud crab, Dyspanopeus sayi (Brachyura: Panopeidae) is a native shallow subtidal and inter-tidal inhabitant of the Atlantic coastline of North America and an invasive species in the Mediterranean and Black Seas. Little is known about the microparasites of this host and the broader Panopeidae. We describe a novel microsporidian parasite infecting the musculature of D. sayi from Malagash, Nova Scotia (Canada), at a prevalence of 7%. Histopathology and molecular diagnostics were used to describe pathology and parasite phylogenetics, respectively. Based on SSU rDNA gene sequencing we propose that the microsporidian requires establishment of a new genus (Panopeispora n. gen.) and species (Panopeispora mellora n. sp.), due to significant differences to closest known taxa (e.g. Facilispora margolisi [81% similarity] and Thelohania butleri [80% similarity]), residing in Clade V of the Microsporidia. Archived, wax-embedded histological material was re-processed for transmission electron microscopy to obtain preliminary details of its intracellular development cycle and ultrastructure within the host musculature. The discovery of this pathogen is discussed with relevance to microsporidian taxonomy and the potential for achieving ultrastructural data from archived material.
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Fazhan H, Waiho K, Quinitio E, Baylon JC, Fujaya Y, Rukminasari N, Azri MFD, Shahreza MS, Ma H, Ikhwanuddin M. Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp. PeerJ 2020; 8:e8066. [PMID: 31915566 PMCID: PMC6944125 DOI: 10.7717/peerj.8066] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 10/20/2019] [Indexed: 11/20/2022] Open
Abstract
There are four species of mud crabs within the genus Scylla, and most of them live sympatrically in the equatorial region. Apart from a report in Japan about the finding of a natural Scylla hybrid more than a decade ago after the division of genus Scylla into four species by Keenan, Davie & Mann (1998), no subsequent sighting was found. Thus, this study investigates the possible natural occurrence of potential hybridization among Scylla species in the wild. A total of 76,211 individuals from mud crab landing sites around the Malacca Straits, South China Sea and Sulu Sea were screened. In addition to the four-purebred species, four groups (SH 1, n = 2, 627; SH 2, n = 136; SH 3, n = 1; SH 4, n = 2) with intermediate characteristics were found, mostly at Sulu Sea. Discriminant Function Analysis revealed that all Scylla species, including SH 1 - 4, are distinguishable via their morphometric ratios. The most powerful discriminant ratios for each character and the top five discriminant ratios of males and females were suggested. The carapace width of SH 1 males and females were significantly smaller than pure species. Based on the discriminant ratios and the description of morphological characters, we hypothesize that the additional four groups of Scylla with intermediate characteristics could be presumed hybrids. Future work at the molecular level is urgently needed to validate this postulate.
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Affiliation(s)
- Hanafiah Fazhan
- Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, China.,STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, Guangdong, China.,Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
| | - Khor Waiho
- Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, China.,STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, Guangdong, China.,Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
| | - Emilia Quinitio
- Aquaculture Department, Southeast Asian Fisheries Development Center, Iloilo, Philippines
| | - Juliana C Baylon
- Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, Ioilo, Philippines
| | - Yushinta Fujaya
- Faculty of Marine Science and Fishery, Hasanuddin University, Makassar, Indonesia
| | - Nita Rukminasari
- Faculty of Marine Science and Fishery, Hasanuddin University, Makassar, Indonesia
| | - Mohammad Farhan Darin Azri
- Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak, Malaysia
| | - Md Sheriff Shahreza
- Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia.,School of Fisheries and Aquaculture Sciences, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
| | - Hongyu Ma
- Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, China.,STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, Guangdong, China
| | - Mhd Ikhwanuddin
- STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou, Guangdong, China.,Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
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