akarensis, Betta Regan [C. T.] 1910:779, Pl. 77 (fig. 3) [Proceedings of the Zoological Society of London 1909 (pt 4) (art. 2) (for 9 Nov. 1909); ref. 14593] Akar River, Sarawak state, Borneo, East Malaysia. Holotype (unique): BMNH 1895.7.2.44. •Valid as Betta akarensis Regan 1910 -- (Vierke 1986:83 [ref. 36452], Vierke 1988:118 [ref. 36453], Witte & Schmidt 1992:326, 327 [ref. 14256], Kottelat et al. 1993:161 [ref. 23448], Kottelat 1995:63 [ref. 21728], Kottelat & Lim 1996:248 [ref. 23210], Tan & Kottelat 1998:43 [ref. 23543], Doi et al. 2001:17 [ref. 25691], Tan & Lim 2004:114 [ref. 27716], Tan & Ng 2005:67 [ref. 28354], Parenti & Lim 2005:194 [ref. 28285], Tan & Ng 2004:279 [ref. 28058], Tan 2009:501 [ref. 30388], Kottelat 2013:449 [ref. 32989], Sulaiman et al. 2018:37 [ref. 35802], Kamal et al. 2020:192 [ref. 37675]). Current status: Valid as Betta akarensis Regan 1910. Osphronemidae: Macropodusinae. Distribution: Brunei and Sarawak (Malaysia), Borneo. Habitat: freshwater.