International Commission on Zoological Nomenclature:
OPINIONS and DIRECTIONS

taxa names:

Ay

aygula Linnaeus 1758 [originally in Simia], Systema Naturae, Ed. 10, vol. 1, p. 27 (suppressed under the plenary power for the purposes of the Principle of Priority but not for those of the Principle of Homonymy) (Mammalia, Primates). Opinion 1400