melanocephalus, Bathytroctes Vaillant [L. L.] 1888:155, Pl. 11 (figs. 3-3b) [Expéditions scientifiques du "Travailleur" et du "Talisman"; ref. 4496] Off Morocco, Soudan, Banc d'Arguin, depth 1435-2500 meters, eastern Atlantic. Lectotype: MNHN 1885-0167. Paralectotypes: MNHN 1886-0003 (1), plus 2 lost specimens. Type catalog: Bertin 1940:274 [ref. 293]. Figured paralectotype referred to Bellocia vaillanti Parr 1951 -- (Krefft 1973:88 [ref. 7166]). •Valid as Holtbyrnia melanocephala (Vaillant 1888) -- (Sazonov & Trunov 1978:91 [ref. 8882], Carneiro et al. 2019:80 [ref. 37250]). Current status: Valid as Holtbyrnia melanocephala (Vaillant 1888). Platytroctidae. Distribution: Eastern Atlantic: off Morocco. Habitat: marine.