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Sewellia elongata Roberts, 1998 |
| Family: | Gastromyzontidae (Hillstream loaches) | |||
| Max. size: | 7.3 cm SL (male/unsexed) | |||
| Environment: | demersal; freshwater | |||
| Distribution: | Asia: Se Kong of the Mekong basin. | |||
| Diagnosis: | Vertebrae: 35-37. The following combination of characters distinguished this species from its congeners: body without dark stripes; paired fins with no concentric bands; pelvic fin reaching beyond anus; general appearance elongated; body width at the origin of dorsal fin 20.7-24.4% SL; caudal peduncle depth 8.0-9.6 % SL; caudal peduncle length 1.0-1.2 times in its depth; predorsal length 46.5-49.5% SL; pelvic-fin origin in front of dorsal-fin origin; absence of cavity around mouth; skin-fold between oropectoral membrane and ventral surface of head running from pectoral-fin origin to second rostral barbel; tubercles on top of head concentrated on lateral parts of snout; absence of large tubercles on branched pectoral-fin rays 15-21; and 65-70 lateral line scales. Very dark, almost black when alive; color pattern changes after preservation (Ref. 40433). | |||
| Biology: | Occurs in moderately high gradient forested montane stream with large boulders, a coarse gravel or sandy bottom and some logs. Also found in an extremely high gradient, tumultuous mountain stream with huge boulders and coarse gravel bottom. | |||
| IUCN Red List Status: | Near Threatened (NT); Date assessed: 19 February 2011 Ref. (130435) | |||
| Threat to humans: | harmless | |||