Ptychognathus Stimpson, 1858 is a speciose genus in the family Varunidae, widely distributed in the Indo-West Pacific. Although species of Ptychognathus are common in estuaries with low salinity, some species are difficult to be identified correctly because of their small body size and similar morphology. This study describes one new species, Ptychognathus amikee sp. nov., from Vanuatu based on the morphological differences and the genetic data from mitochondrial cytochrome c oxidase subunit 1 (COI). This new species can be distinguished from the other congeners by the characters of the carapace, male chelipeds, and ambulatory legs.
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Ptychognathus Stimpson, 1858 is a speciose genus in the family Varunidae, widely distributed in the Indo-West Pacific. Although species of Ptychognathus are common in estuaries with low salinity, some species are difficult to be identified correctly because of their small body size and similar morphology. This study describes one new species, Ptychognathus amikee sp.
View Article and Find Full Text PDFIntegrative taxonomy study of brackish water crabs of the genus Ptychognathus Stimpson, 1858 (Crustacea: Brachyura: Varunidae) from Polynesia, with description of two new species.
Zootaxa
July 2024
Muséum national d'Histoire naturelle; UMR BOREA; CP026; 57; rue Cuvier; F-75231 Paris; Cedex 05; France.
In the present contribution, five species of Ptychognathus Stimpson, 1858 are reported from Polynesia: P. crassimanus Finnegan, 1931, P. easteranus Rathbun, 1907, P.
View Article and Find Full Text PDFRedescription of the brackish water crab Ptychognathus glaber Stimpson, 1858 based on the topotypic material from the Ogasawara Islands and new record of P. lipkei N.K. Ng, 2010 from Japan (Decapoda: Brachyura: Varunidae).
Zootaxa
October 2021
Tropical Biosphere Research Center, Iriomote Station, University of the Ryukyus, 870 Uehara, Okinawa 907-1541, Japan. .
Examination of material from various Japanese localities clarified that the estuarine crab Ptychognathus glaber Stimpson, 1858 is possibly restricted to the Ogasawara Islands, Japan. Specimens from the Ryukyu Islands, thought to represent P. glaber, actually represent P.
View Article and Find Full Text PDFDiversity of Taiwanese Brackish Crabs Genus Stimpson, 1858 (Crustacea: Brachyura: Varunidae) based on DNA Barcodes, with Descriptions of Two New Species.
Zool Stud
November 2020
Department of Life Science, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan. E-mail: (Hsu).
Species in the brackish crab genus are common in the seashore and estuary habitats with freshwater input. Due to their similar morphologies and dull colorations, it is always difficult to distinguish the species in this genus. In this study, the DNA barcode gene (cytochrome oxidase subunit I) was used to help identify from Taiwan.
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