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 Palaeoheterodonta Newell, 1965 Count: [*†*] 2o;7f; †27f [29 Jan 2022] Order Unionida Gray, 1854 Count: [*†*] 6f; †12f [29 Jan 2022] ?Superfamily †Archanodontoidea Modell, 1957 [monotypic] Count: [†*] †1f [28 Jan 2022] Family †Archanodontidae Modell, 1957 Count: -