imbellis, Betta Ladiges [W.] 1975:262, Figs. [Die Aquarien- und Terrarienzeitschrift (DATZ) v. 28 (no. 8); ref. 7224] Kuala Lumpur, Malaysia. Holotype: ZMH H4644. Paratypes: ZMH H4520 (11). Type catalog: Wilkens 1977:160 [ref. 22013]. •Valid as Betta imbellis Ladiges 1975 -- (Vierke 1986:91 [ref. 36452], Vierke 1988:128 [ref. 36453], Schaller & Kottelat 1989:31 [ref. 13604], Witte & Schmidt 1992:327 [ref. 14256], Kottelat et al. 1993:162 [ref. 23448], Ng & Kottelat 1994:593 [ref. 22076], Britz & Cambray 2001:280 [ref. 25647], Tan & Ng 2005:78 [ref. 28354], Tan & Ng 2005:125 [ref. 28283], Kuwasupat et al. 2012:49 [ref. 32254], Kowasupat et al. 2012:387 [ref. 32320], Kottelat 2013:451 [ref. 32989], Ng et al. 2019:534 [ref. 36606], Jamaluddin et al. 2022:[6] [ref. 39245], Poungcharean & Limpivadhana 2022:106 [ref. 39979], Ahmad et al. 2023:125 [ref. 41243]). Current status: Valid as Betta imbellis Ladiges 1975. Osphronemidae: Macropodusinae. Distribution: Southeast Asia: Malaya (Malaysia), northern Sumatra (Indonesia). IUCN (2019): Least Concern. Habitat: freshwater.