Holotype of Opistognathus ctenion (KAUM–I. 174226, 30.6 mm SL, off Mage-shima island, Osumi Islands, Kagoshima, Japan) A fresh and B preserved specimens photographed by KAUM and K. Fujiwara, respectively C X-ray image, photographed by K. Fujiwara.

 
 
  Part of: Fujiwara K, Motomura H, Shinohara G (2023) Opistognathus ctenion (Perciformes, Opistognathidae): a new jawfish from southern Japan. ZooKeys 1179: 353-364. https://doi.org/10.3897/zookeys.1179.109813