Heterochelamon Türkay & Dai, 1997

Naruse, Tohru, Zhu, Chunchao & Zhou, Xianmin, 2013, Two new species of freshwater crabs of the genus Heterochelamon Türkay & Dai, 1997 (Crustacea: Decapoda: Brachyura: Potamidae) from Guangxi Zhuang Autonomous Region, southern China, Zootaxa 3647 (4), pp. 567-576 : 575

Key to species of Heterochelamon Türkay & Dai, 1997

1. External orbital angle blunt, lobe-like......................................... H. guangxiense Türkay & Dai, 1997

-. External orbital angle triangular to acutely triangular......................................................... 2

2. Distal segment of G1 clearly widened distally, widest part more than twice basal width of distal segment................ 3

-. Distal segment of G1 not widened to slightly widened distally, widest part less than twice basal width of distal segment …… 4

3. Distal segment of G1 strongly bent proximally.............................................. H. tessellatum n. sp.

-. Distal segment of G1 straight.............................................. H. yangshuoense Türkay & Dai, 1997

4. Epibranchial tooth small, with small gap from external orbital tooth; distal segment of G1 straight.......................................................................... H. aff. purpureomanualis (recorded by Türkay & Dai, 1997)

-. Epibranchial tooth large, with large gap from external orbital tooth; distal segment of G1 slightly curved at distal tip....... 5

5. Front almost entire; external orbital tooth sharp, narrow; gap between external orbital tooth and epibranchial tooth wider.............................................................................. H. purpureomanualis (Wu, 1934)

-. Front bilobed; external orbital tooth triangular; gap between external orbital tooth and epibranchial tooth narrower............................................................................................... H. castanea n. sp.