Gastromyzon russulus Tan, 2006
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 Family:  Balitoridae (River loaches)
 Max. size:  6.43 cm SL (male/unsexed)
 Environment:  demersal
 Distribution:  Asia: Kayan and Mahakam River basins in Kalimantan Timur, Indonesia.
 Diagnosis:  Dorsal soft rays (total): 9-9; Anal soft rays: 5-5; Vertebrae: 31-32. Can be distinguished from its congeners by possessing the following unique combination of characters: body plain dark brown or black in adults, body brown with numerous thin cream bars and blotches in juveniles; head dorsum dark brown with cream reticulate pattern; all fins reddish when alive; absence of secondary rostrum; absence of a postoral pouch; gill slit angular, subopercular groove present and continuous to pectoral fin origin; a rounded and elongate snout when viewed dorsally; presence of sublacrymal groove; abdomen without scales; lateral line with 64-71 scales; pelvic fin just touching anal fin origin, adpressed dorsal fin not overlapping level of anal fin origin (Ref. 57871).
 IUCN Red List Status: Not Evaluated  (Ref. 96402)
 Threat to humans:  harmless
 Country info:   

 Entered by: Torres, Armi G. - 07.02.07
 Modified by: Bailly, Nicolas - 31.10.12

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