simplex, Betta Kottelat [M.] 1994:301, Figs. 3-5 [Ichthyological Exploration of Freshwaters v. 5 (no. 4); ref. 21572] Spring (small lake) of Tham Sra Kaew and Nine Ponds, 2.2 kilometers from National highway 4034, northwestern Krabi, Krabi Province, Thailand. Holotype: ZRC 38486 [ex CMK 10635]. Paratypes: CMK 9445 (4); ZRC 35168-69 (2). •Valid as Betta simplex Kottelat 1994 -- (Tan & Kottelat 1998:558 [ref. 23781], Schindler & Schmidt 2004:3 [ref. 28030], Tan & Ng 2005:45 [ref. 28354], Schindler & Schmidt 2006:57 [ref. 28865], Kottelat 2013:452 [ref. 32989]). Current status: Valid as Betta simplex Kottelat 1994. Osphronemidae: Macropodusinae. Distribution: Thailand. Habitat: freshwater.