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aqua 27(3)_Esomus nimasowi

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Volume 27, Issue 3 – 30 September 2021

Santoshkumar Abujam, Budhin Gogoi, Arup Nama Das, Debangshu Narayan Das & Shyama Prasad Biswas: Esomus nimasowi, a new species of flying barb (Cypriniformes: Danionidae) from Assam, north-eastern India, pp. 81-92

 

 

 

 

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SINGLE PAPER


Volume 27, Issue 3 – 30 September 2021

Santoshkumar Abujam, Budhin Gogoi, Arup Nama Das, Debangshu Narayan Das & Shyama Prasad Biswas: Esomus nimasowi, a new species of flying barb (Cypriniformes: Danionidae) from Assam, north-eastern India, pp. 81-92

Abstract

Esomus nimasowi, a new species of flying barb, is described from the Phongloso stream (a small tributary of the Kopili River) at Wasubil village in Dima Hasao district, Assam north-eastern India. The new species differs from its congeners including Esomus danrica, Esomus bengalensis and Esomus thermoicos in having a shorter maxillary barbel just reach 1/3rd of pectoral-fin length (vs. maxillary barbel very long, extending to mid of pectorals or ventral fin insertion or slightly beyond anal-fin origin); tip of pectoral fin just reach origin of pelvic fin when adpressed (vs. distinctly crossed beyond pelvic fin base). The new species can be distinguished from its congener except E. bangalensis by the absence (presence) of lateral line in E. danrica (incomplete) and in E. thermoicos (complete) and it also differs from its congeners except E. danrica in having lesser predorsal scales (15-16 vs. 17-20). Further, it differs from all congers by the unique combination of the following characters: pre-ventral length (48.6-54.6% SL), pre-anal length (70.2-75.1% SL), dorsal-fin length (21.0-23.4% SL), ventral-fin length (18.0-20.5% SL), length of ventral- fin base (3.2-4.2% SL), caudal peduncle depth (11.1-11.8% SL), pectoral fin to ventral fin distance (19.5-24.0% SL), eye diameter (24.8-29.2% SL), interorbital distance (31.7-41.6% SL), maxillary barbel (114.9-140.9% SL) and pectoral fin branched ray (i,8-9).