Abstract
A new species of sisorid catfish of the genus Exostoma is described from the Siang River in Arunachal Pradesh, northeastern India. The new species, Exostoma dhritiae, can be distinguished from congeners by the condition of the posterior extremity of the adipose-fin base, the degree of tuberculation on the dorsal surface of the head, and the shape of striae on the anterolateral surface of lips. Further, it is distinguished by the morphometric data for the body depth at the anus, maxillary barbel length, adipose fin base length, caudal peduncle length, caudal peduncle depth and the number of branched pectoral-fin rays. It is the twentieth reported species of Exostoma.
References
Arunkumar, L. (2020) Exostoma laticaudata, a new glyptosternine catfish (Teleostei: Sisoridae) from Manipur, Northeastern India. Species, 21 (68), 293−305.
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. https://doi.org/10.24272/j.issn.2095-8137.2017.065
Darshan, A., Vishwanath, W., Abujam, S. & Das, D.N. (2019) Exostoma kottelati, a new species of catfish (Teleostei: Sisoridae) from Arunachal Pradesh, India. Zootaxa, 4585 (2), 369–377. https://doi.org/10.11646/zootaxa.4585.2.10
Gong, Z., Lin, P., Liu, F. & Huanzhang, L. (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. https://doi.org/10.11646/zootaxa.4527.3.8
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 (1), 1–44, pls. 1–4.
Lalramliana, Lalronunga, S., Lalnuntluanga & Ng. H. H. (2015) Exostoma sawmteai, a new sisorid catfish from northeast India (Teleostei: Sisoridae). Ichthyological Exploration of Freshwaters, 26, 59–64.
Luo, Z. & Chen, X. (2020) Exostoma dulongensis, a new glyptosternine catfish from the Irrawaddy basin, Yunnan, China (Siluriformes: Sisoridae). Zootaxa, 4802 (1), 99–110. https://doi.org/10.11646/zootaxa.4802.1.6
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. (2018) Exostoma ericinum, a new glyptosternine catfish from southwestern China (Teleostei: Siluriformes: Sisoridae). Zootaxa, 4420 (3), 405–414. https://doi.org/10.11646/zootaxa.4420.3.6
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. https://doi.org/10.11646/zootaxa.3869.4.6
Ng, H.H. & Kottelat, M. (2018) A new glyptosternine catfish from northern Myanmar (Teleostei: Siluriformes: Sisoridae). Copeia, 106 (1), 63–69. https://doi.org/10.1643/CI-17–613
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. https://doi.org/10.1080/03745480509442815
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.
Shangningam, B.D. & Kosygin, L. (2020) A New Sisorid Catfish of the Genus Exostoma Blyth from the ChindwinIrrawaddy Drainage in Northeastern India (Teleostei: Siluriformes). Copeia, 108 (3), 545–55. https://doi.org/10.1643/CI-19-248
Tamang, L., Sinha, B. & Gurumayum, S.D. (2015) Exostoma tenuicaudata, a new species of glyptosternine catfish (Siluriformes: Sisoridae) from the upper Brahmaputra drainage, northeastern India. Zootaxa, 4048 (3), 441–445. https://doi.org/10.11646/zootaxa.4048.3.9
Thomson, A.W. & Page, L.M. (2006) Genera of the Asian catfish families Sisoridae and Erethistidae (Teleostei: Siluriformes). Zootaxa, 1345 (1), 1–96. https://doi.org/10.11646/zootaxa.1345.1.1
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. https://doi.org/10.11646/zootaxa.4476.1.5
Vishwanath, W. & Joyshree, H. (2007) A new sisorid catfish of the genus Exostoma Blyth from Manipur, India. Zoos’ Print Journal, 22, 2531–2534.