Ephippus Cuvier, 1816, EPHIPPIDAE Gill, 1861, Scatophagus Cuvier, 1831 and SCATOPHAGIDAE Bleeker, 1876 (Osteichthyes): proposed conservation of current usage by designation of Chaetodon orbis Bloch, 1787 as type species of Ephippus.

The article discusses the proposed conservation of stability in the nomenclature and taxonomy of two families of marine fishes by designating Chaetodon orbis by M. E. Bloch in 1787 as the type species of the genus Ephippus under Articles 65.2.1 and 65.2.2 of the International Code of Zoological Nomenclature. It claims that the type species of Ephippus is actually C. argus and not C. orbis, and that Chaetodon argus is also the type species of Scatophagus. Ephippus and Scatophagus are claimed to be the type genera of the family-group names Ephippidae and Scatophagidae, respectively, under current usage. It therefore proposes to designate C. orbis as type species of the genus Ephippus to stabilise the current usage.