Betta schalleri Kottelat & Ng, 1994
Betta schalleri
photo by Hippocampus-Bildarchiv

Family:  Osphronemidae (Gouramies), subfamily: Macropodusinae
Max. size:  4.48 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  Asia: presently known only from Banka, Indonesia.
Diagnosis:  Dorsal spines (total): 2-2; Dorsal soft rays (total): 8-9; Anal spines: 2-4; Anal soft rays: 23-25. Distinguished from other members from Sumatra, Indonesia in the following characters: more anal fin rays (27 vs. 23-25); more dorsal fin rays than Betta cracens and Betta fusca (10-11 vs. 8-9); more subdorsal scales than Betta cracens and B. fusca (6 1/2-7 vs. 5 1/2-6); more lateral scales than B. fusca (31 vs. 29); fewer lateral scales than Betta cracens (31 vs. 32-33); fewer predorsal scales than Betta cracens, Betta fusca and Betta raja (17-19 vs. 20-24); greater head length than Betta pugnax, Betta cracens and Betta fusca (35-.5-36.5% SL vs. 27.5-35.2); smaller predorsal length than Betta fusca (62.7-66.3% SL vs. 68.5-70.2); greater preanal length than Betta cracens (47.8-50.9% SL vs. 42.0-46.1); greater body depth than Betta cracens (26.7-27.6% SL vs. 21.2-24.2); greater dorsal fin base length than Betta cracens (12.4-13.9% SL vs. 10.5-11.6); smaller anal fin base length than Betta cracens (50.4-52.0% SL vs. 53.4-55.7); greater orbital diameter than Betta cracens and Betta fusca (61-76% postorbital length vs. 47-58) (Ref. 56386).
Biology:  Found in forest swamp, peat swamp and hill stream.
IUCN Red List Status: Endangered (EN); Date assessed: 07 January 2019 (B1ab(iii)) Ref. (124695)
Threat to humans:  harmless
Country info:   

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