hageni, Sicyopterus Popta [C. M. L.] 1921:211 [Zoologische Mededeelingen (Leiden) v. 6 (art. 15); ref. 15325] Sunda Islands, Indonesia. Syntypes: SMF 6621 (1), 6622-37 (16), 6638 (1). •Valid as Sicyopterus hageni Popta 1921 -- (Allen 1991:194 [ref. 21090], Parenti & Maciolek 1993:963 [ref. 21279], Watson et al. 2000:30 [ref. 25138], Larson & Murdy 2001:3602 [ref. 26293], Larson & Pidgeon 2004:197 [ref. 28107], Keith et al. 2012:301 [ref. 31972], Kottelat 2013:428 [ref. 32989], Parenti 2021:418 [ref. 38603]). •Synonym of Sicyopterus microcephalus (Bleeker 1855) -- (Keith et al. 2015:116 [ref. 34328], Parenti 2021:420 [ref. 38603]). Current status: Synonym of Sicyopterus microcephalus (Bleeker 1855). Oxudercidae: Sicydiinae. Habitat: freshwater, brackish, marine.