siamensis, Tylognathus de Beaufort [L. F.] 1927:5 [Journal of the Siam Society, Natural History Supplement v. 7 (no. 1); ref. 15777] Payao Swamp, Changwad of Chiengmai, Thailand. Holotype: ZMA 112583. Paratypes: ZMA 112584 (1). Type catalog: Monkolprasit 1969:15 [ref. 25088], Nijssen et al. 1982:37 [ref. 19236]. Subjectively invalid; secondarily preoccupied in Henicorynchus by Henicorhynchus siamensis (Sauvage 1881). See Morara siamensis Sauvage 1881. •Mention in genus Henicorhynchus -- (Kottelat 1984:803 [ref. 11440]). •Valid as Henicorhynchus siamensis (de Beaufort 1927) -- (Rainboth 1996:112 [ref. 22772]). •Synonym of Henicorhynchus siamensis (Sauvage 1881) -- (Kottelat 2001:54 [ref. 25780]). •Synonym of Gymnostomus siamensis (Sauvage 1881) -- (Kottelat 2013:108 [ref. 32989], Ciccotto & Page 2020:496 [ref. 37710]). 2°Homonym. Current status: Synonym of Henicorhynchus siamensis (Sauvage 1881). Cyprinidae: Labeoninae. Habitat: freshwater.