Sewellia patella Freyhof & Serov, 2000
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Family:  Gastromyzontidae (Hillstream loaches)
Max. size:  4.82 cm SL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  Asia: Viet Nam.
Diagnosis:  Vertebrae: 33-33. Two elongated or roundish central lobes on the second simple anal-fin ray in specimens larger than 25 mm SL and lepidotrichia of branched pelvic-fin rays 8-16 dorsoposteriorly hypertrophied into large projecting processes in males. No dark stripes on body; no concentric bands on paired fins. Pectoral-fin origin in front of corner of mouth. Pelvic fin reaching 50-80% of distance between anus and anal-fin origin. No cavity around the mouth, no skin-fold between oropectoral membrane and ventral surface of head (Ref. 40433). Description: dorsal fin with 3 simple and 8 branched rays; anal fin with 2 simple and 4 branched rays; pectoral fin with 1 simple and 23-24 branched rays; pelvic fin with 1 simple and 19 branched rays (Ref. 40433).
Biology:  Inhabits a river with a succession of riffles over coarse gravel and larger single stones and deep pools over sandy bottom. Rheophilous, caught in only in riffles or rapids with current velocity from 0.6 to more than 1 m/sec. Found with Garra cambodgiensis, Schistura sp. and Homaloptera yunnanensis. Feeds on aquatic invertebrates (Ref. 40433).
IUCN Red List Status: Endangered (EN); Date assessed: 05 September 2010 (A2acd) Ref. (124695)
Threat to humans:  harmless
Country info:   

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