Eirmotus isthmus Tan & Kottelat, 2008

Family:  Cyprinidae (Minnows or carps), subfamily: Cyprininae
Max. size:  3.25 cm SL (male/unsexed)
Environment:  pelagic; freshwater
Distribution:  Asia: Sumatra and Borneo in Indonesia.
Diagnosis:  Dorsal soft rays (total): 11-11; Anal soft rays: 8-8; Vertebrae: 29-31. Differs from other congeners by having subinferior mouth, with a narrow lower jaw whose tip is angulous in ventral view. Can be further differentiated by the presence of small black mark immediately in front of anus with scattered chromatophores near it, visible in lateral view; lacking or very faintly marked bar 1; simple dorsal-fin rays black, black mark not reaching the first branched ray, rest of fin hyaline; posterior margin of last simple dorsal-fin ray with 22-26 serrae; bars narrow, width of bar 5 equal to ½ or less lateral row scale (Ref. 78741).
Biology:  Occurs in lakes and large permanent water bodies in the floodplain. Caught in water column together with Hyalobagrus flavus (Bagridae), Pseudeutropius brachypopterus, P. moolenburghae (Schilbeidae) and Gymnochanda filamentosa (Ambassidae) (Ref. 78741).
IUCN Red List Status: Data deficient (DD); Date assessed: 21 January 2019 Ref. (130435)
Threat to humans:  harmless


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