Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Pteriomorphia Beurlen, 1944 Order Pectinida Gray, 1854 Superfamily Plicatuloidea Gray, 1854 [monotypic] 1 Family Plicatulidae Gray, 1854