Type locality, Province Narathiwat, about 20 km west of Narathiwat at street to Marubo, MTD F 30341 (holotype of Betta apollon, 5.1 cm SL, adult male). Known only from the hill streams west of Narathiwat in peninsular Thailand. Formerly, specimens from southern Thailand were classified as
B. taeniata or identified as B. pugnax by Vierke in Geisler (1981). (Ref. 78499).