Class Bivalvia Linnaeus, 1758 - bivalves Count: [*†*] 16o;110f; †6o;225f [31 Jan 2022] Subclass Autobranchia Grobben, 1894 Count: [*†*] 13o;98f; †6o;203f [31 Jan 2022] Superorder Heteroconchia Gray, 1854 Count: [*†*] 7o;75f; †3o;116f [31 Jan 2022] Clade Heterodonta Neumayr, 1884 Count: [*†*] 5o;68f; †3o;86f [31 Jan 2022] Order Pholadomyida Newell, 1965 Count: [*†*] 20f; †10f [31 Jan 2022] Superfamily Pandoroidea Rafinesque, 1815 Count: [*] 2f [31 Jan 2022] 1 Family Pandoridae Rafinesque, 1815 Count: - 2 Family Lyonsiidae Fischer, 1887 Count: -