Sewellia marmorata Serov, 1996
Sewellia marmorata
photo by Hippocampus-Bildarchiv

Family:  Gastromyzontidae (Hillstream loaches)
Max. size:  5.89 cm SL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  Asia: catchment of the River Vinh Thanh in Vietnam.
Diagnosis:  Vertebrae: 33-34. Body without dark stripes. Cavity with deep post-oral skinfold around mouth. A submarginal band on posterior part of paired fins. Origin of pectoral fin behind corner of the mouth. Origin of pelvic in front of dorsal-fin origin; pelvic fin reaching anal-fin origin; dorsal keels on pelvic-fin rays continuously or marginally serrated. Absence of skin-fold between oropectoral membrane and ventral surface of head. Lateral line with 40-47 scales (Ref. 40433). Description: dorsal fin with 3 simple and 8 branched rays, last one split to base; anal fin with 2 simple and 4 branched rays, second simple ray flat with fine lateral serration, posteriormost part of this ray soft and articulated; pectoral fin with 1 simple and 23-24 branched rays, last rays covering anterior part of pelvic, reaching vertical of base of branched pelvic-fin rays 5-8; pelvic fin with 1, rarely 2, simple and 19-21 branched rays, mostly reaching anal-fin origin (Ref. 40433).
Biology:  Collected from streams with shallow rapids; current relatively slow and water very clear; deep pools with detritus and muddy or sandy substrate. Stomach contents indicate that this species feeds on aquatic invertebrates (Ref. 40433).
IUCN Red List Status: Endangered (EN); Date assessed: 05 September 2010 (A2c; B1ab(i,ii,iii)) Ref. (124695)
Threat to humans:  harmless
Country info:   

Entered by: Torres, Armi G. - 27.04.00
Modified by: Bailly, Nicolas - 31.10.12

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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