diaphanus, Helmichthys Costa [O. G.] 1844:Helmichthys p. 2, Pl. 31 [Fauna del regno di Napoli Part 1; ref. 976] Mediterranean Sea. No types known. Published 12 Mar 1844. •Synonym of Ariosoma balearicum (Delaroche 1809) -- (Blache et al. 1973:241 [ref. 7185], Smith 1989:495 [ref. 13285], Smith 1989:726 [ref. 13285], Smith 1990:157 [ref. 13454]). Current status: Synonym of Ariosoma balearicum (Delaroche 1809). Congridae: Bathymyrinae. Habitat: marine.