Margaritifera
Margaritifera is a genus of freshwater mussels, aquatic bivalve molluscs in the family Margaritiferidae, the freshwater pearl mussels. == Species == Species within the genus Margaritifera include: Margaritifera auricularia or Pseudunio auricularia Margaritifera falcata (Gould, 1850) Margaritifera hembeli (Conrad, 1838) Margaritifera margaritifera (Linnaeus, 1758) — Freshwater pearl mussel (includes Margaritifera margaritifera durrovensis Phillips, 1928) Margaritifera marrianae R. I. Johnson, 1983 The following fossil species are known from the mid-Cretaceous of Mongolia, being formerly classified in the genus Unio: †Margaritifera elongata (Martinson, 1982) †Margaritifera sainshandensis (Martinson, 1982) †Margaritifera glabra (Kolesnikov, 1956) == References) == Starobogatov, Y. I. (1970).