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| Nanhaipotamon longhaiense Cai, Tan & Zou, 2021 |
Abstract
A new species of freshwater crab of the genus Nanhaipotamon Bott, 1968 is described from Xiaye Village, Chengxiang Town, Longhai County, Zhangzhou City, Fujian Province, China. The new species is distinguished from congeners by the combination of characters of its carapace, third maxilliped, unequal chelipeds, triangular male abdomen and unique male first gonopod. Molecular evidence derived from partial mitochondrial 16S rRNA and COI genes also support the species as new.
Keywords: freshwater crab, new species, Oriental region, taxonomy
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| Nanhaipotamon longhaiense sp. nov. Holotype male (25.2 × 21.5 mm) (NCU MCP 417701). A overall habitus B frontal view of cephalothorax. Scale bars: 1 cm. |
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| Nanhaipotamon longhaiense sp. nov. holotype male (25.2 × 21.5 mm) (NCU MCP 417701) A ventral view of anterior thoracic sternum, telson, and male pleonal somites 4–6 B ventral view of sterno-pleonal cavity with G1 in situ C the fourth ambulatory leg D left third maxilliped. Scale bars: 5 mm. |
Family Potamidae Ortmann, 1896
Nanhaipotamon Bott, 1968
Nanhaipotamon longhaiense sp. nov.
Diagnosis: Carapace subquadrate, regions indistinct, anterolateral regions slightly rugose; cervical groove shallow and wide, H-shaped groove shallow; postorbital cristae sharp, almost fused with epigastric cristae (Figs 1A, 3A). External orbital angle triangular, separated from anterolateral margin by wide, concave notch; epibranchial teeth small, granular; anterolateral margin lined with conspicuous granules (Figs 1A, 3A). Third maxilliped merus with shallow median depression, exopod flagellum slightly longer than 1/3 exopod length (Fig. 2D). Chelipeds strongly unequal; fingers with small gap when closed (Figs 1A, 3A). G1 slender, inner distal angle semicircular, inner margin of terminal segment convex, distal margin flat, outer distal angle blunt, laterally bent outwards at angle of about 60° (Figs 4A–D, 5A). Female vulvae ovate, medium-sized, wholly within sternite 6, opening directed inward (Fig. 3B).
Mao-Rong Cai, Qi-Hong Tan and Jie-Xin Zou. 2021. A New Species of Freshwater Crab of the Genus Nanhaipotamon Bott, 1968 (Crustacea, Decapoda, Brachyura, Potamidae) from Longhai, Fujian Province, China. ZooKeys. 1062: 11-30. DOI: 10.3897/zookeys.1062.71171
