Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2019-04-12
Page range: 369–377
Abstract views: 71
PDF downloaded: 1

Exostoma kottelati, a new species of catfish (Teleostei: Sisoridae) from Arunachal Pradesh, India

Centre with Potential for Excellence in Biodiversity, Rajiv Gandhi University, Rono Hills, Doimukh-791112, India.
Department of Life Sciences, Manipur University, Canchipur-795 003, Manipur, India.
Fishery and Aquatic Biology Laboratory, Department of Zoology, Rajiv Gandhi University, Rono Hills, Doimukh-791112, India.
Centre with Potential for Excellence in Biodiversity, Rajiv Gandhi University, Rono Hills, Doimukh-791112, India.
Pisces New sisorid Ranga River Brahmaputra basin


Exostoma kottelati, new species, is described from the Ranga River, Brahmaputra basin, in Arunachal Pradesh state, northeastern India. It differs from congeners in the Brahmaputra River basin in having a longer adipose-fin base (33.4–36.0 % SL vs. 23.4–32.9), a greater (except E. mangdechhuensis) pre-pelvic length (45.6–47.3 % SL vs. 39.3–44.6) and a greater pre-anal length (73.9–76.5 % SL vs. 62.2–70.1). It further differs from all known congeners by the following unique combination characters: the adipose fin is distinctly separated from the dorsal procurrent caudal-fin rays, pre-dorsal length 38.9–41.7% SL, adipose-fin base length 33.4–36 % SL, caudal peduncle length 18.7–21.1 % SL, caudal peduncle depth 8.8–9.5 % SL, and body depth at anus 12.5–13.5 % SL. This is the fifth species of Exostoma known from the Brahmaputra River basin.



  1. Blyth, E. (1860) Report on some fishes received chiefly from the Sitang River and its tributary streams, Tenasserim Provinces. Journal of the Asiatic Society of Bengal, 29 (2), 138–174.

    Chen, X.Y., Poly, W.J., Catania, D. & Jiang, W.S. (2017) A new species of sisorid catfish of the genus Exostoma from the Salween drainage, Yunnan, China. Zoological Research, 38 (5), 291–299.

    Darshan, A., Kachari, A., Dutta, R., Ganguly, A. & Das, D.N. (2016) Amblyceps waikhomi, a New Species of Catfish (Siluriformes: Amblycipitidae) from the Brahmaputra Drainage of Arunachal Pradesh, India. PLoS ONE, 11 (2), e0147283.

    Gong, Z., Lin, P., Liu, F. & Liu, H. (2018) Exostoma tibetana, a new glyptosternine catfish from the lower Yarlung Tsangpo River drainage in southeastern Tibet, China (Siluriformes: Sisoridae) Zootaxa, 4527 (3), 392–402.

    Hora, S.L. (1923) Notes on fishes in the Indian Museum, V. On the composite genus Glyptosternon McClelland. Records of the Indian Museum, Calcutta, 25 (Pt. 1), 1–44, pls. 1–4.

    Hora, S. & Silas, E.G. (1952) Notes on fishes in the Indian museum. XLVII. Revision of the Glyptosternoid fishes of the family Sisoridae with description of new genera and species. Records of the Indian Museum, 49, 5–29.

    Jayaram, K.C. (1999) The Freshwater Fishes of the Indian Region. Narendra Publishing House, Delhi, 551 pp.

    Kottelat, M. (2013) The fishes of the inland waters of Southeast Asia: a catalogue and core bibliography of the fishes known to occur in freshwaters, mangroves and estuaries. The Raffles Bulletin of Zoology, 27, 1–663.

    Lalramliana, Lalronunga, S., Tluanga, L. & Ng, H.H. (2015) Exostoma sawmteai, a new sisorid catfish from northeast India (Teleostei: Sisoridae). Ichthyological Exploration of Freshwaters, 26 (1), 59–64.

    McClelland, J. (1842) On the fresh-water fishes collected by William Griffith, Esq., F. L. S. Madras Medical Service, during his travels under the orders of the Supreme Government of India, from 1835 to 1842. Calcutta Journal of Natural History, 2 (8), 560–589,

    Ng, H.H. & Kottelat, M. (2018) A New Glyptosternine Catfish from Northern Myanmar (Teleostei: Siluriformes: Sisoridae). Copeia, 106 (1), 63–69.–613.

    Ng, H.H. & Vidthayanon, C. (2014) A review of the glyptosternine catfish genus Exostoma Blyth 1860 from Thailand, with descriptions of two new species (Teleostei: Siluriformes). Zootaxa, 3869 (4), 420–434.

    Ng, H.H. (2018) Exostoma ericinum, a new glyptosternine catfish from southwestern China (Teleostei: Siluriformes: Sisoridae). Zootaxa, 4420 (3), 405–414.

    Regan, C.T. (1905) A synopsis of the species of the silurid genera Parexostoma, Chimarrhichthys and Exostoma. Annals and Magazine of Natural History, Series 7, 15 (86), Article 13, 182–185.

    Roberts, T.R. (1994) Systematic revision of Asian bagrid catfishes of the genus Mystus sensustricto, with a new species from Thailand and Cambodia. Ichthyological Exploration of Freshwaters, 5, 241–256.

    Tamang, L., Sinha, B. & Gurumayum, Sh. D. (2015) Exostoma tenuicaudata, a new species of glyptosternine catfish (Siluriformes: Sisoridae) from the upper Brahmaputra drainage, northeastern India. Zootaxa, 4048 (3), 441–445.

    Thomson, A.W. & Page, L.M. (2006) Genera of the Asian catfish families Sisoridae and Erethistidae (Teleostei: Siluriformes). Zootaxa, 1345, 1–96.

    Thoni, R.J. & Gurung, D.B. (2018) Morphological and molecular study of the torrent catfishes (Sisoridae: Glyptosterninae) of Bhutan including the description of five new species. Zootaxa, 4476 (1), 040–068.

    Vishwanath, W. & Joyshree, H. (2007) A new sisorid catfish of the Exostoma Blyth from Manipur, India. Zoos’ Print Journal, 22 (1), 2531–2534.