mystax, Sicyopus (Smilosicyopus) Watson [R. E.] & Allen [G. R.] 1999:117, Fig. 3 [aqua, Journal of Ichthyology and Aquatic Biology v. 3 (no. 3); ref. 24140] Aiyindor Creek, Biak Island, Irian Jaya, Indonesia. Holotype: MZB 9221. Paratypes: WAM P.31262-004 (4). Type catalog: Moore et al. 2008:45 [ref. 30117]. •Valid as Sicyopus mystax Watson & Allen 1999 -- (Larson & Murdy 2001:3603 [ref. 26293], Watson & Kottelat 2006:121 [ref. 28766], Keith & Marquet 2005:390 [ref. 28469] in subgenus Smilosicyopus, Keith et al. 2010:303 [ref. 30933] in subgefnus Smilosicyopus). •Valid as Smilosicyopus mystax (Watson & Allen 1999) -- (Keith et al. 2011 [ref. 31023] based on status of Smilosicyopus, Keith & Taillerbois 2014:69 [ref. 33422], Parenti 2021:424 [ref. 38603]). •Synonym of Smilosicyopus leprurus (Sakai & Nakamura 1979) -- (Keith et al. 2015:166 [ref. 34328]). Current status: Synonym of Smilosicyopus leprurus (Sakai & Nakamura 1979). Oxudercidae: Sicydiinae. Habitat: freshwater, brackish, marine.