On a new species of freshwater crab, Indochinamonkhinpyae, from northern Myanmar (Crustacea, Brachyura, Potamidae).

Peter K L Ng,Win Mar

doi:10.3897/zookeys.811.29187

Abstract

A new species of freshwater crab of the genus Indochinamon Yeo & Ng, 2007 (family Potamidae), is described from highlands north of Myitkyina in Kachin State, Myanmar. Indochinamonkhinpyaesp. n. is distinguished from congeners by its very rugose carapace, broad male pleon and distinctively structured male first gonopod; and is the first potamid species recorded from northern Myanmar.

Highlights

The freshwater crabs (Brachyura, Potamidae, Gecarcinucidae) of Indochina are very diverse, with the fauna still in a survey and discovery stage
Established by Yeo and Ng (2007) for Indochinese species previously placed in Potamon Savigny, 1816, s. lato, Indochinamon is defined by a suite of characters: carapace low with a relatively flat dorsal surface; the epigastric cristae are separated from the postorbital cristae by a distinct groove; the postorbital cristae is not confluent with the epibranchial tooth; the exopod of the third maxilliped has a long flagellum; the ambulatory legs are relatively short and stout; the male pleon is narrowly triangular; the sternopleonal cavity reaches an imaginary line joining the median parts of the coxae of the chelipeds; and the G1 terminal segment is relatively short, with the groove for the G2 marginal in position, and the dorsal flap is either absent or only low and broad
Adult male specimens of I. khinpyae have a strongly sculptured and very rough carapace (Fig. 2F), the G1 terminal segment is relatively long, gently curved, distally bent and the dorsal margin has no trace of a flap (Fig. 4A–D, F, H)

Summary

Introduction

The freshwater crabs (Brachyura, Potamidae, Gecarcinucidae) of Indochina are very diverse, with the fauna still in a survey and discovery stage. Indochinamon phongnha Naruse, Nguyen & Yeo, 2011 – paratypes: 5 males (25.4×20.2 – 44.2×33.2 mm), 6 females (17.9×14.1 – 43.0×32.6 mm), 1 juvenile (15.4×12.5 mm) (ZRC 2010.0168), Khe Con Khai stream, Cha Noi, Phong Nha, Quang Binh Province, Vietnam,17°38.196'N, 106°05.928'E, 263 m asl, coll.

Results

Conclusion