A new species of freshwater crab, Teretamon kapota sp. nov. (Decapoda: Brachyura: Potamidae) and a new record from Arunachal Pradesh, North-Eastern India


  • Zoological Survey of India, Fire Proof Spirit Building, 27 Jawahar Lal Nehru Road, Kolkata – 700 016, West Bengal
  • Zoological Survey of India, Western Regional Centre, Akurdi, Pune – 411 044, Maharashtra




Acanthopotamon fungosum, Crustacea, New Record, Potamiscinae, Taxonomy


A new species of the potamid freshwater crab, Teretamon kapota sp. nov., is described from the East Siang and Lower Dibang Valley districts of the Arunachal Pradesh state, north-eastern India. Teretamon kapota sp. nov. can be distinguished from the congeners mainly by the relatively small eye as compared to the orbital space, the gently concave lateral margins of the male telson, and the very high, strongly convex, semicircular dorsal flap on the terminal segment of the male first gonopod that somewhat resembles a pigeon’s head. The potamid genus, Teretamon Yeo and Ng, 2007, is now known by five species, including the present new species. An identification key is provided for the genus. Another potamine crab, Acanthopotamon fungosum (Alcock, 1909), constitutes a new record to Arunachal Pradesh also reported. Arunachal Pradesh is now known to have 17 species of freshwater crabs (13 potamid and 4 gecarcinucid species), including the present new species and the new record.


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How to Cite

Mitra, S., & Kumar Pati, S. (2021). A new species of freshwater crab, <i>Teretamon kapota</i> sp. nov. (Decapoda: Brachyura: Potamidae) and a new record from Arunachal Pradesh, North-Eastern India. Records of the Zoological Survey of India, 121(1), 1–10. https://doi.org/10.26515/rzsi/v121/i1/2021/153202





Absar, P.F., Mitra, S. and Kharkongor, I.J. 2017. Teretamon spelaeum, a new species of freshwater crab (Crustacea: Decapoda: Potamidae) from a limestone cave in Meghalaya, India. Zootaxa, 4365(3):302-310. https://doi.org/10.11646/zootaxa.4365.3.2 PMid:29686206

Alcock, A. 1909. Diagnoses of new species and varieties of freshwater crabs.No.1-3. Rec. Indian Mus., 3(3): 243-252.

Alcock, A. 1910. Catalogue of the Indian Decapod Crustacea in the collection of the Indian Museum. Part 1. Brachyura. Fasciculus II. The Indian fresh-water crabs - Potamonidae. Trustees of the Indian Museum, Calcutta: 1-135.

Bott, R. 1970. Die Süßwasserkrabben von Europa, Asien, Australien und ihre Stammesgeschichte. Eine Revision der Potamoidea und der Parathelphusoidea (Crustacea, Decapoda). Abh. Senckenb. Naturforsch. Ges., 526: 1-338.

Davie, P.J.F., Guinot, D. and Ng, P.K.L. 2015. Anatomy and functional morphology of Brachyura. In: Castro P., Davie P.J.F., Guinot D., Schram F.R. and von Vaupel Klein J.C. (Eds.), Treatise on Zoology - Anatomy, Taxonomy, Biology. The Crustacea. v. 9 (Part C-I). Decapoda: Brachyura (Part 1): 11-163. (Publ. Brill, Leiden). https://doi.org/10.1163/9789004190832_004

Mitra, S. 2017. Freshwater crabs (Crustacea: Decapoda: Gecarcinucidae and Potamidae) of Mizoram. Rec. zool. Surv. India, Occ. Paper No., 382: 1-43.

Mitra, S. 2020. Abortelphusa namdaphaensis, a new genus and new species of freshwater crab (Decapoda, Brachyura, Gecarcinucidae) from Arunachal Pradesh, India. Crustaceana, 93(7): 803-817. https://doi.org/10.1163/15685403-bja10027

Mitra, S., Payra, A. and Chandra, K. 2018. A new species of freshwater crab of the genus Teretamon Yeo and Ng, 2007 (Decapoda: Brachyura: Potamidae) from Arunachal Pradesh, northeastern India. Zootaxa, 4500(4): 587-595. https://doi.org/10.11646/zootaxa.4500.4.8 PMid:30486053

Ng, P.K.L. 1988. The freshwater crabs of Peninsular Malaysia and Singapore. National University of Singapore, Shinglee Press, Singapore: 1-156.

Pati, S.K. and Thackeray, T. 2018. The freshwater crab genera Ghatiana Pati and Sharma, Gubernatoriana Bott and Inglethelphusa Bott (Crustacea: Decapoda: Brachyura: Gecarcinucidae) revisited, with descriptions of a new genus and eleven new species. Zootaxa, 4440(1): 1-73. https://doi.org/10.11646/zootaxa.4440.1.1 PMid:30313127

Pati, S.K., Mitra, S. and Yeo, D.C.J. 2019. A new species of Acanthopotamon Kemp, 1918 (Decapoda: Brachyura: Potamidae: Potaminae) from northeastern India, with a key to the species of the genus and notes on their distribution in relation to freshwater ecoregions. J. Crust. Biol., 39(4): 450-458. https://doi.org/10.1093/jcbiol/ruz040

Yeo, D.C.J. and Ng, P.K.L. 2004. Recognition of two subfamilies in the Potamidae Ortmann, 1896 (Brachyura, Potamidae) with a note on the genus Potamon Savigny, 1816. Crustaceana, 76(10): 1219-1235. https://doi.org/10.1163/156854003773123456

Yeo, D.C.J. and Ng, P.K.L. 2007. On the genus “Potamon†and allies in Indochina (Crustacea: Decapoda: Brachyura: Potamidae). Raffles Bull. Zool., Suppl. No., 16: 273-308.