Xenocephalus Kaup [J. J.] 1858:85 Masc. Xenocephalus armatus Kaup 1858. Type by monotypy. •Senior synonym of currently-recognized genus Gnathagnus Gill 1861 in family Uranoscopidae (and valid) -- (Springer & Bauchot 1994;79 [ref. 21269]). •Valid as Xenocephalus Kaup 1858 -- (Kishimoto 2001:3520 [ref. 26287], Bray & Hoese 2006:1514 [ref. 29049], Gomon 2008:683 [ref. 30614], Gomon & Roberts 2011:3 [ref. 31180], Shinohara et al. 2011:54 [ref. 31715], Vilasri 2013:90 [ref. 33304], Gomon 2015:1490 [ref. 34298], Fricke et al. 2018:303 [ref. 35805], Fricke et al. 2019:253 [ref. 36673]). Current status: Valid as Xenocephalus Kaup 1858. Uranoscopidae.