xenica, Arisoma nystromi Matsubara [K.] & Ochiai [A.] 1951:8, Fig. 6 [Memoirs of the College of Agriculture Kyoto University No. 59; ref. 12898] Choshi, Chiba Prefecture, Japan. Holotype: FAKU M7593. Paratypes: FAKU M2192 (1), M7903 (1). Original genus should have been Ariosoma. •Valid as Gnathophis xenica (Matsubara & Ochiai 1951) -- (Smith 1989:521 [ref. 13285], Asano in Masuda et al. 1984:28 [ref. 6441], Nakabo 2000:230 [ref. 25086], Shinohara et al. 2001:294 [ref. 25995], Nakabo 2002:230 [ref. 26001], Ho et al. 2018:237 [ref. 36049]). Current status: Valid as Gnathophis xenica (Matsubara & Ochiai 1951). Congridae: Congrinae. Distribution: Western North Pacific: Japan. Habitat: marine.