Betta raja Tan & Ng, 2005
Betta raja
photo by Wickham, M.

Family:  Osphronemidae (Gouramies), subfamily: Macropodusinae
Max. size:  6.38 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  Asia: Sumatra, Indonesia.
Diagnosis:  Dorsal spines (total): 1-2; Dorsal soft rays (total): 7-10; Anal spines: 2-2; Anal soft rays: 23-26; Vertebrae: 28-30. Pelvic fin very long in mature males (15-23 anal fin rays at pelvic fin end, even exceeding anal-fin base in some specimens); anal fin and lower half of caudal fin with dark margins; anal fin rays 25-28 (mode 26); lateral scales 30-32 (mode 31); head length 33.9-37.4% SL; predorsal length 20.0-24.6% SL; preanal length 46.1-52.4% SL; and body length 62.8-70.7% SL (Ref. 56386).
Biology:  Inhabits lowland swamp forests (Ref. 56386).
IUCN Red List Status: Least Concern (LC); Date assessed: 05 January 2019 Ref. (126983)
Threat to humans:  harmless

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