semiocellatus, Macrognathus Roberts [T. R.] 1986:99, Figs. 1 (b-d) [Japanese Journal of Ichthyology v. 33 (no. 2); ref. 5802] Ubon Ratchatani market ("presumably caught in Mun River, near Ubon Ratchatani, Mekong basin"), Thailand. Holotype: NRM 24782. Paratypes: BMNH 1985.8.21.3-12 (11), CAS 57350-51 (11, 10), IRSNB 729 (10), KUMF (4 lots), MNHN 1985-0800 (10), NRM 24783-85 (6, 69, 1), NIFI (8 lots), TNRC (Thailand Nat. Res. Council, Bangkok) (8 lots), UMMZ 213430-40 (1, 1, 2, 20, 4, 2, 4, 1, 14, 9, 31). Type catalog: Walschaerts 1987:46 [ref. 20755]. •Synonym of Macrognathus taeniagaster (Fowler 1935) -- (Rainboth 1996:179 [ref. 22772]). •Valid as Macrognathus semiocellatus Roberts 1986 -- (Kottelat 1998:117 [ref. 23436], Freyhof et al. 2000:97 [ref. 25184], Arunkumar & Tombi Singh 2000:121 [ref. 25674], Kottelat 2001:147 [ref. 25780], Kottelat 2013:312 [ref. 32989], Kottelat 2015:49 [ref. 33971], Taki et al. 2021:349 [ref. 39830]). Current status: Valid as Macrognathus semiocellatus Roberts 1986. Mastacembelidae. Distribution: Southeast Asia: Mae Klong, Chao Phraya and Mekong River basins, Thailand, Laos, Cambodia and Vietnam. Habitat: freshwater.