Betta hipposideros Ng & Kottelat, 1994

Family:  Osphronemidae (Gouramies), subfamily: Macropodusinae
Max. size:  7.79 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  Asia: known from Selangor and Perak in Malaysia. Its range extends to Riau Archipelago, Indonesia (Ref. 56386).
Diagnosis:  Dorsal spines (total): 1-1; Dorsal soft rays (total): 8-8; Anal spines: 2-2; Anal soft rays: 28-28. Differs from Betta chloropharynx in the following characters: horseshoe-shaped black throat mark (vs. ยต-shaped black throat mark); presence of both dorsal and caudal transverse bars (vs. absence); more subdorsal scales (mode 6 1/2 vs. 5-6). It is distinguished from Betta renata in the following characters: horseshoe-shaped black throat mark (vs. kidney-shaped); non-spotted opercle (vs. spotted opercle); opercle with yellow or brown lower margin (vs. black margin); fewer postdorsal scales (mode 12 vs. 9 1/2); more anal fin rays (mode 30 vs. 29); more lateral scales (mode 32 vs. 31). Can be differentiated from Betta spilotogena in the following characters: horseshoe-shaped black throat mark ((vs. black median spot); non-spotted opercle (vs. spotted opercle); opercle with yellow or brown lower margin (vs. back margin); presence of both dorsal and caudal transverse bars (vs. absence); and more subdorsal scales (mode 6 1/2 vs. 5 1/2) (Ref. 56386).
Biology:  Occurs in backwater peat swamps with substrate usually peat and leaf litter. Large fish are found in the flowing sections of the blackwater streams and smaller ones appear to prefer pools and slower flowing waters.
IUCN Red List Status: Endangered (EN); Date assessed: 05 January 2019 (B1ab(iii)) Ref. (130435)
Threat to humans:  harmless


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