| ABSTRACT: | The status of the genus Erginus Jeffreys, 1877 is discussed for the first time since the taxon was proposed. The Recent species Acmaea apicina Dall, 1879, Acmaea sybaritica Dall, 1871, Problacmaea moskalevi Golikov and Kussakin, 1972, Patella rubella Fabricius, 1780 and the fossil species Acmaea vaderensis Lindberg, 1979 and Acmaea asmiiformis Yokoyama, 1926 are here assigned to the genus. A new species, Erginus puniceus, is described from the western boreal Pacific Ocean and the fossil species Erginus vaderensis from the Eocene of Washington is redescribed.
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