A new species of freshwater crab of the genus Teretamon Yeo & Ng, 2007 (Decapoda: Brachyura: Potamidae) from Arunachal Pradesh, northeastern India Author Mitra, Santanu Zoological Survey of India, F. P. S. Building, 27 J. L. Nehru Road, Kolkata- 700016, West Bengal, India santanuzsi@gmail.com Author Payra, Arajush Zoological Survey of India, M- block, New Alipore, Kolkata- 700053, West Bengal, India Author Chandra, Kailash Zoological Survey of India, M- block, New Alipore, Kolkata- 700053, West Bengal, India text Zootaxa 2018 2018-10-18 4500 4 587 595 journal article 10.11646/zootaxa.4500.4.8 1175-5326 5297864 F61A839A-0967-46BA-92B6-F183FA4B87D1 Key to the species of Teretamon 1. Carapace almost subquadrate, no trace of epibranchial tooth, chelipeds and ambulatory legs glabrous ( Fig. 2A ; Alcock 1910 : fig. 11, pl. 3)......................................................................................... 2 - Carapace much wider than long, small epibranchial tooth present, chelipeds and ambulatory legs setose............................................................................................. T. spelaeum ( Meghalaya , India ) 2. Inner middle part of G1 acutely triangular, tip narrowly pointed ( Yeo & Ng, 2007 : fig.13A)........ T. adiatretum ( Myanmar ) - Inner middle part of G1 not acutely triangular, tip pointed to blunt............................................... 3 3. G1 terminal segment relatively slender, inner lateral part semi-circularly convex, tip narrowly pointed ( Mitra, 2017 : fig.116– 118).......................................................................... T. indicum ( Mizoram , India ) - G1 terminal segment twisted, inner lateral part bluntly triangular, tip triangular ( Fig. 4A–D )............................................................................................... T. kempi n.sp. ( Arunachal Pradesh , India