caligans, Symbranchus Cantor [T. E.] 1849:1316 [334], Pl. 7 (fig. 1-3) [Journal of the Asiatic Society of Bengal v. 18 (pt 2); ref. 715] Penang, Malaysia. Syntypes: (2) BMNH 1860.3.19.943 (1). On p. 334 of separate. •Valid as Macrotrema caligans (Cantor 1849) -- (Rosen & Greenwood 1976:50 [ref. 7094], Bailey & Gans 1998:6 [ref. 23296], Lim in Randall & Lim 2000:604 [ref. 25122], Proudlove 2006:269 [ref. 28992], Britz et al. 2011:51 [ref. 31404], Kottelat 2013:307 [ref. 32989], Yoshida et al. 2013:73 [ref. 34464], Jamaluddin et al. 2022:[7] [ref. 39245]). Current status: Valid as Macrotrema caligans (Cantor 1849). Synbranchidae. Distribution: Southeast Asia: Thailand, Malaysia and Singapore. Habitat: freshwater, brackish.