Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Pteriomorphia Beurlen, 1944 Order Pteriida Newell, 1965 Superfamily Pinnoidea Leach, 1819 [monotypic] 1 Family Pinnidae Leach, 1819 - pen clams