International Commission on Zoological Nomenclature:
OPINIONS and DIRECTIONS
Io
Iodina Mörch 1860, J. Conchyliol., 8: 282 (gender: feminine) (type species, by designation by Wenz 1940 (Handb. Paläozool., 6 Gastropoda, 1(1)(4): 816): Janthina exigua Lamarck [1816], Ency. méth. (Vers.): pl. 456 and expl.) (Gastropoda). Opinion 989
Iodotropheus Oliver & Loiselle 1972, Revue de Zoologie et de Botanique Africaines, 85(3-4): 310 (gender: masculine) (type species, by monotypy: Iodotropheus sprengerae Oliver & Loiselle 1972) (Osteichthyes, Perciformes). Opinion 1871
Ioeidopoda Holmberg 1917, Anales del Museo Nacional de Historia Natural de Buenos Aires, 28: 562 (suppressed under the plenary power for the purposes of both the Principle of Priority and the Principle of Homonymy) (Insecta, Hymenoptera). Opinion 2069
Ioeidospilos Holmberg 1917, Anales del Museo Nacional de Historia Natural de Buenos Aires, 28: 565 (suppressed under the plenary power for the purposes of both the Principle of Priority and the Principle of Homonymy) (Insecta, Hymenoptera). Opinion 2069