Perisesarma tuerkayi, a new species of mangrove crab from Vietnam (Decapoda, Brachyura, Sesarmidae), with an assessment of its phylogenetic relationships

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A new species of Perisesarma, P. tuerkayi, is described from mangroves of Tan Thoi Island, southern Vietnam. Morphologically, the new species differs most significantly from congeners by the tuberculation pattern of the chelar dactylus, its unique G1 morphology, an unusually large maximum body size, and relatively short and broad ambulatory legs. Genetically, P. tuerkayi n. sp. is markedly divergent from other congeneric species, both in mitochondrial and nuclear DNA. It is the fifth species of Perisesarma reported from Vietnam.

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References

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Figures

  • Perisesarma tuerkayi n. sp., holotype, male (28.2 × 24.0 mm) (QL-W28348). A, Overall dorsal view; B, ventral view. Scale bar = 1 cm.

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  • Perisesarma tuerkayi n. sp., holotype male (28.2 × 24.0 mm) (QL-W28348). A, Carapace dorsal view; B, pleon; C, frontal view of carapace; D, dorsal view of left chela; E, outer view of right chela; F, inner view of right chela; G, frontal view of primary pectinated crests; H, inner side of propodus and dactylus of second pereiopod. Scale bars: A-C = 1 cm; D-H = 1 mm.

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  • Perisesarma tuerkayi n. sp., holotype male (28.2 × 24.0 mm) (QM-W28348). A, Dorsal view of denuded right G1; B, apical process of right G1; C, cross view of apical corneous process and aperture; D, left G1 with setae; E, simple setae on apical process of left G1; F, plumose setae on apical process of left G1; G, second gonopod; H, penis. Scale bars: A, D = 1 mm; B, C, E-H = 0.5 mm.

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  • Perisesarma tuerkayi n. sp., paratype female (25.27 × 21.20 mm) (QM-W27002). A, Overall dorsal view; B, ventral view; C, vulva; D, pleon. Scale bars: A, B, D = 10 mm; C = 1 mm.

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  • Phylogenetic consensus dendrogram constructed with Maximum Likelihood (ML) (using the software raxmlGUI) of selected species of Perisesarma, including P. tuerkayi n. sp. from a concatenated dataset of Cox1 and 16S mitochondrial genes. Only bootstrap values higher than 50% are shown in the dendrogram.

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  • Maximum parsimony network for NaK genotypes for a subset of species of Perisesarma, constructed with PopART.

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  • Comparison of the apical processes of G1 (dorsal view) in selected species of Perisesarma. A, P. tuerkayi n. sp., holotype, male (28.2 × 24.0 mm) (QM- W27002); B, P. eumolpe (De Man, 1895), male (16.83 × 13.92 mm) (SMF 49922), China, Hainan, Wen Chang; C, P. maipoense (Soh, 1978) male (25.27 × 19.57 mm) (ZRC 2009.0800), Vietnam, mouth of the Red River; the arrows indicate position of aperture. Scale bar = 0.25 mm.

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  • Proximal dactylar tubercles in A, P. tuerkayi n. sp., holotype, male (28.2 × 24.0 mm) (QM- W27002); B, P. eumolpe (De Man, 1895), male (16.83 × 13.92 mm) (SMF 49922), China, Hainan, Wen Chang. Scale bar = 1 mm.

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