Schistura geisleri Kottelat, 1990
photo by Suvarnaraksha, A.

Family:  Nemacheilidae (Brook loaches)
Max. size:  3.2 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  Asia: Chao Phraya basin, Thailand.
Diagnosis:  Dorsal soft rays (total): 12-12; Anal soft rays: 8-8. Distinguished by its unique color pattern: young (2-2.5 cm SL) with 5-8 dark brown blotches, usually longitudinally elongated along lateral line and 6-8 saddles along dorsal mid-line, while adults the saddles extend downward and superficial pigments are superimposed to the former pattern, forming a marmorated pattern; large hammer-shaped suborbital flap in males (its depth about half eye diameter); and thickened first branched pectoral ray in males (Ref. 39226).
Biology:  Occurs in stream with slow current and with depth never more than 30 cm during the dry season. Also found in shallow riffles over pebbles up to 5 cm in diameter, with clear water and moderate current. A female measuring 3.12 cm SL contained ripe ovulae about 0.7 mm in diameter (Ref. 39226).
IUCN Red List Status: Least Concern (LC); Date assessed: 07 July 2011 Ref. (130435)
Threat to humans:  harmless


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