polyactis, Melanocetus Regan [C. T.] 1925:565 [Annals and Magazine of Natural History (Series 9) v. 15 (no. 91); ref. 3677] Gulf of Panama, 6°40'N, 80°47'W, about 1750 meters. Lectotype: ZMUC P9260. Paralectotypes: (2) BMNH 1925.8.11.32 (1); ZMUC P92155 (1). Type catalog: Nielsen 1974:86 [ref. 9588]. Lectotype selected by Bertelsen 1951:55 [ref. 287]. •Valid as Melanocetus polyactis Regan 1925 -- (Castellanos-Galindo et al. 2006:200 [ref. 28944], Pietsch 2009:364 [ref. 30766], Page et al. 2023:165 [ref. 40505]). Current status: Valid as Melanocetus polyactis Regan 1925. Melanocetidae. Distribution: Eastern Pacific. Habitat: marine.