arx, Ilyophis Robins [C. H.] in Robins & Robins 1976:265, Figs. 4, 6, 7b, 8 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 127; ref. 3784] Southeastern Pacific, 1°48'S, 90°19'W, depth 3225 meters. Holotype: ANSP 133808. Paratypes: ANSP 133809 (2), 133810 (1, c&s). Type catalog: Böhlke 1984:158 [ref. 13621]. •Valid as Ilyophis arx Robins 1976 -- (Robins & Robins 1989:238 [ref. 13287], Smith 1999:1661 [ref. 24661], Karmovskaya & Parin 1999:323 [ref. 23869], Tashiro & Chen 2022:4 [ref. 39512]). Current status: Valid as Ilyophis arx Robins 1976. Synaphobranchidae: Ilyophinae. Distribution: Eastern Pacific and eastern North Atlantic. Habitat: marine.