Urostomias (subgenus of Eustomias) Regan [C. T.] & Trewavas [E.] 1930:72, 78 Masc. Eustomias macrurus Regan & Trewavas 1930. Type by original designation. •Synonym of Eustomias Vaillant 1884 (often dated 1888) -- (Gibbs in Morrow & Gibbs 1964:377 [ref. 6962], Morrow 1973:137 [ref. 7175]). •Synonym of Eustomias Vaillant 1884, but a valid subgenus Urostomias Regan & Trewavas 1930 -- (Prokofiev 2020:345 [ref. 37646], Kimura et al. 2023:[1] [ref. 40274]). Current status: Synonym of Eustomias Vaillant 1884. Stomiidae: Melanostomiinae.