Class Bivalvia Linnaeus, 1758 - bivalves
Subclass Autobranchia Grobben, 1894
Superorder Heteroconchia Gray, 1854
Clade Heterodonta Neumayr, 1884
Order Myida Stoliczka, 1870
Superfamily Pholadoidea Lamarck, 1809
Family Pholadidae Lamarck, 1809 - piddocks
Subfamily Xylophaginae Purchon, 1941, nom. illeg.
see Family Xylophagaidae Purchon, 1941