Opinion 495 Designation., under the Plenary Powers of a type species in harmony with accustomed usage for the nominal genus Unio Philipsson, 1788 (class Pelecypoda) and validation under the same Powers of the family-group name Margaritiferidae Haas, 1940
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1957, in volume 17, issue 17, pages 287-322
Date published:1957