ctenion, Opistognathus Fujiwara [K.], Motomura [H.] & Shinohara [G.] 2023:354, Figs. 1-5 [ZooKeys No. 1179; ref. 40475] Off Mage-shima Island, Osumi Islands, Kagoshima, Japan, depth 35 meters. Holotype: KAUM-I 174226. Paratypes: KAUM-I 174227 (1), NSMT-P 130174 (1). •Valid as Opistognathus ctenion Fujiwara, Motomura & Shinohara 2023. Current status: Valid as Opistognathus ctenion Fujiwara, Motomura & Shinohara 2023. Opistognathidae. Distribution: Western Pacific: Osumi and Ryukyu Islands, southern Japan. Habitat: marine.