laevis, Xenoceratias Regan [C. T.] & Trewavas [E.] 1932:56, Fig. 83 [Dana Report No. 2; ref. 3682] South China Sea, 14°37'N, 119°52'E, station 3731, depth about 1000 meters (2000 meters of wire out). Holotype (unique): ZMUC P9249. Type catalog: Nielsen 1974:87 [ref. 9588]. •Synonym of Melanocetus johnsonii Günther 1864 -- (Maul 1973:667 [ref. 7171] as johnson, Bertelsen 1990:492 [ref. 15654] as johnsoni, Pietsch 2009:362 [ref. 30766]). Current status: Synonym of Melanocetus johnsonii Günther 1864. Melanocetidae. Habitat: marine.