Amblyceps waikhomi, a New Species of Catfish (Siluriformes: Amblycipitidae) from the Brahmaputra Drainage of Arunachal Pradesh, India

Abstract

Amblyceps waikhomi sp. nov. is described from the Nongkon stream which drains into the Noa Dehing River, a tributary of the Brahmaputra River, in Arunachal Pradesh, India. The new species can be distinguished from congeners (except A. torrentis) in having a deeper body depth at anus. It further differs from congeners (except A. mangois and A. serratum) in having fewer vertebrae, from A. mangois in lacking (vs. having) strongly-developed projections on the proximal lepidotrichia of the median caudal-fin rays, and in having a longer, wider, and deeper head; and from A. serratum in having a posteriorly smooth (vs. with 4–5 serrations) pectoral spine, and unequal jaw length (lower jaw longer and weakly-projecting anteriorly vs. equal upper and lower jaws). It additionally differs from A. murraystuarti, A. torrentis, A. apangi, A. laticeps, and A. cerinum in having a deeply forked (vs. emarginate or truncate) caudal fin. This species is the seventh amblycipitid species known to occur in the Ganga-Brahmaputra River system.

DNA barcoding of freshwater fishes from Brahmaputra River in Eastern Himalaya biodiversity hotspot

“…The genus Amblyceps is known by eight species from northeast India (Darshan et al. 2016 ). Among them, four species ( A. apangi , A. arunchalensis , A. laticeps , and A. mangois ) showed 9.7–17.2% genetic distances and monophyletic clustering in BA tree.…”

Amblyceps crassioris, a new sisoroid catfish from Odisha, India (Siluriformes: Amblycipitidae)

“…Two specimens (CIARI/FF‐98) were cleared and stained following the single‐staining procedure of Taylor and Van Dyke (1985) for vertebral count. Additional data for comparison were obtained for Amblyceps murraystuarti from Chaudhuri (1919) and Ng and Kottelat (2000); for Amblyceps platycephalus, Amblyceps foratum , Amblyceps serratum , and Amblyceps variegatum from Ng and Kottelat (2000); for Amblyceps macropterus from Ng (2001); for Amblyceps carinatum from Ng (2005); for Amblyceps arunachalense from Vishwanath and Linthoingambi (2007); for Amblyceps torrentis and Amblyceps tuberculatum from Linthoingambi and Vishwanath (2008); for Amblyceps protentum and Amblyceps kurzii from Ng and Wright (2009); for Amblyceps caecutiens from Ng and Kottelat (2000), Ng and Wright (2009) and Ng and Kottelat (2018); for Amblyceps cerinum from Ng and Wright (2010); for Amblyceps waikhomi from Darshan et al (2016); for Amblyceps accari from Dahanukar et al (2016); for Amblyceps yunnanensis from Zhang et al (2016); for Amblyceps improcerum and Amblyceps laticeps from Ng and Kottelat (2018) and for Amblyceps hmolaii from Singh et al (2022).…”

“…and Amblyceps kurzii from Ng and Wright (2009); for Amblyceps caecutiens from Ng and Kottelat (2000), Ng and Wright (2009) and Ng and Kottelat (2018); for Amblyceps cerinum from Ng and Wright (2010); for Amblyceps waikhomi from Darshan et al (2016); for Amblyceps accari from Dahanukar et al (2016); for Amblyceps yunnanensis from Zhang et al (2016); for Amblyceps improcerum and Amblyceps laticeps from Ng and Kottelat (2018) and for Amblyceps hmolaii from Singh et al (2022).…”

First Record of Catfish Amblyceps waikhomi (Darshan, Kachari, Dutta, Ganguly, and Das 2016) (Siluriformes: Amblycipitidae) for Nepal from the Singhiya River of Morang District, Eastern Nepal

“…Te specimen's diagnostic features were examined and measured in accordance with [3,[5][6][7], including standard length, predorsal length, preanal length, prepelvic length, prepectoral length, length of the dorsal fn base, length of the anal fn base, length of the pelvic fn, length of the pectoral fn, length of the caudal peduncle, body depth at the anus, head length, width, and depth, and also, meristic counts of the dorsal, pectoral, pelvic, anal, and caudal fn rays were performed. Morphometric and meristic data were compared with the literature for A.…”