Grammonus Gill [T. N.] in Goode & Bean 1896:317 Masc. Oligopus ater Risso 1810. Type by monotypy. Authorship is given as Gill by Goode and Bean, but Gill evidently only responsible for name and workers may wish to credit authorship to Goode & Bean. •Synonym of Oligopus Risso 1810 -- (Cohen 1964:2 [ref. 6891], Nielsen 1973:551 [ref. 6885], Cohen & Nielsen 1978:49 [ref. 881]). •Valid as Grammonus Gill 1896 -- (Nielsen & Cohen in Nielsen et al. 1999:96, 103 [ref. 24448], Nielsen 2003:974 [ref. 27009], Nielsen & Cohen 2004:83 [ref. 28073], Castellanos-Galindo et al. 2006:206 [ref. 28944], Randall & Hughes 2008:137 [ref. 29910], Nielsen & Prokofiev 2010:189 [ref. 30790], Schwarzhans & Nielsen 2011:147 [ref. 31714], Carnevale & Johnson 2015:779 [ref. 34391], Møller et al. 2016:Appendix A [ref. 34432], Golani & Fricke 2018:40 [ref. 36273]). Current status: Valid as Grammonus Gill 1896. Bythitidae.