ICZN. (1957). Opinion 495. Designation under the plenary powers of a type species in harmony with accustomed usage for the nominal genus “
Unio” Philippson, 1788 (class Pelecypoda) and validation under the same powers of the family-group name “Margaritiferidae” Haas, 1940.
Opinions and declarations rendered by the International Commission on Zoological Nomenclature. 17: 289-322.