arenicola, Fierasfer Jordan [D. S.] & Gilbert [C. H.] 1882:363 [Proceedings of the United States National Museum v. 4 (no. 237); ref. 2470] Mazatlán, Sinaloa, western Mexico. Holotype (unique): USNM 29244. •Synonym of Carapus dubius (Putnam 1874) -- (Arnold 1956:270 [ref. 5315]). •Synonym of Encheliophis dubius (Putnam 1874) -- (Markle & Olney 1990:388 [ref. 18996], Markle in Nielsen et al. 1999:16 [ref. 24448], Castro-Aguirre et al. 1999:163 [ref. 24550], Mundy 2005:240 [ref. 28379], Page et al. 2013:94 [ref. 32708]). •Synonym of Carapus dubius (Putnam 1874) -- (recent authors). Current status: Synonym of Carapus dubius (Putnam 1874). Carapidae: Carapinae. Habitat: marine.