elongatus, Radiicephalus Osório [B.] 1917:114, Pl. 2 (figs. 2-4) [= Pl. 30 (figs. 2-4)] [Arquivo da Universidade de Lisboa v. 4; ref. 3318] Coast of Morocco, Discovery station 6187, 34°17'N, 8°00'W, depth 570 meters. Neotype: BMNH 1967.10.2.1. Holotype (unique) at MB was destroyed by fire in 1978 or otherwise lost. Neotype designated by Harrisson & Palmer 1968:190 [ref. 21242]. •Valid as Radiicephalus elongatus Osório 1917 -- (Harrisson & Palmer 1968 [ref. 21242], Palmer 1973:331 [ref. 7195], Heemstra & Kannemeyer 1984:23 [ref. 5349], Palmer in Whitehead et al. 1986:733 [ref. 13676], Heemstra & Kannemeyer 1986:402 [ref. 5666], Aguiar & Quéro 1990:647 [ref. 17478], Santos et al. 1997:51 [ref. 23531], Arruda 1997:74 [ref. 24952], Olney 1999:1972 [ref. 24751], Olney in Randall & Lim 2000:594 [ref. 25122], Olney 2003:956 [ref. 27007], Mundy 2005:237 [ref. 28379], Bray 2008:295 [ref. 30620], Roberts 2012:55 [ref. 32187], Olney & Roberts 2016:1934 [ref. 34578], Angulo & López-Sánchez 2017:587 [ref. 35166], Koeda & Ho 2018:214 [ref. 36253], Carneiro et al. 2019:128 [ref. 37250], Reiner 2019:109 [ref. 38139], Sutton et al. 2020:222 [ref. 37832], Fermon et al. 2022:193 [ref. 39448], Heemstra 2022:229 [ref. 39702]). Current status: Valid as Radiicephalus elongatus Osório 1917. Radiicephalidae. Distribution: Eastern Atlantic; Pacific. Habitat: marine.