Glaucostegus Bonaparte [C. L.] 1846:14 Masc. Rhinobatos cemiculus Geoffroy St. Hilaire 1827. Type by subsequent designation. Earliest type designation apparently Jordan & Evermann 1896:61 [ref. 2443] as Rhina rhinobatus Shaw = Rhina cemiculus Geoffroy. Compagno et al. 2005:61 [ref. 29145] say Whitley 1939 designated Rhinobatos cemiculus St. Hilaire [Geoffroy St. Hilaire] 1817. Correct spelling of the genus of type species should be Rhinobatos. •Objective synonym of Rhinobatos Linck 1790 -- (Krefft & Stehmann 1973:53 [ref. 7167]). •Synonym of Rhinobatos Linck 1790, but a valid subgenus Glaucostegus -- (Compagno 1999:485 [ref. 25589]). •Valid as Glaucostegus Bonaparte 1846 -- (Compagno et al. 2005:61 [ref. 29145], Kottelat 2013:24 [ref. 32989], Last et al. 2016:472 [ref. 34473] in Glaucostegidae, Séret et al. 2016:111 [ref. 34993], White et al. 2017:210 [ref. 35860], Fricke et al. 2018:24 [ref. 35805], Golani & Fricke 2018:14 [ref. 36273], White & Ko'ou 2018:49 [ref. 35922], Habib & Islam 2021:129 [ref. 38397]). Current status: Valid as Glaucostegus Bonaparte 1846. Glaucostegidae.