iyonis, Gnathypops Jordan [D. S.] & Thompson [W. F.] 1913:65, Fig. 1 [Proceedings of the United States National Museum v. 46 (no. 2011); ref. 2542] Yawatahama, Iyo Province, Shikoku, Japan. Holotype (unique): USNM 74763. •Valid as Opistognathus iyonis (Jordan & Thompson 1913) -- (Yoshino in Masuda et al. 1984:200 [ref. 6441], Myoung et al. 1999:139 [ref. 25170], Nakabo 2000:742 [ref. 25086], Nakabo 2002:742 [ref. 26001], Choi et al. 2003:317, 595 [ref. 26218], Hiramatsu & Endo 2013:19 [ref. 32573], Smith-Vaniz 2023:66 [ref. 40049]). Current status: Valid as Opistognathus iyonis (Jordan & Thompson 1913). Opistognathidae. Distribution: Western North Pacific: Chwasari Islands, Korea and Japan. Habitat: marine.