Body elongated, its depth 4-6% TL. Rostrum variably triangular to bluntly rounded. Two nasal-sinus papillae aligned in the middorsal surface of the nasal sinus. Three pairs of barbels on head; the first two about equal in size (0.8-1.0% TL), the third one longer (1.2-1.7% TL). Seven pairs of gill pouches. Each gill pouch with efferent branchial ducts on either side combined into a single external gill aperture posterior to the gill pouches. Branchial ducts on the left side usually confluent with the pharyngocutaneous duct, forming a gill aperture larger than that of right side. Dental muscle overlies gill pouches 1-2. Ventral aorta branches at the second or third gill pouch. Ventral finfold progressively reducing from 2-4 mm (origin) to 1 mm high (cloaca), beginning within anterior 9% of trunk, extending backward to the cloaca. Caudal finfold thin, rounded, beginning immediately posterior to edge of cloaca, extending around tail to dorsal surface, ending about over cloaca. Body proportions (in percentage of TL): prebranchial length 26-31; trunk length 57-61; tail length 10-15; body width 3-5; body depth including VFF 4-7; body depth excluding VFF 4-6; body depth over cloaca 3-5; tail depth 3-5. Counts: multicusp pattern 2/2; anterior unicusps 7-9; posterior unicusps 7-10; total cusps 36-43. Prebranchial pores 26-35; no branchial pores; trunk pores 58-66; tail pores 9-13; total pores 92-111.
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