"* Malleoperna (Iredale, 1939)" . "* Parviperna (Iredale, 1939)" . "* Isognoma (Lightfoot, 1786) (Isognoma is an alternative original spelling for Isognomon)" . "* Pedalion (Dillwyn, 1817)" . "* Sutura (Megerle von M\u00FChlfeld, 1811)" . . "* Isogonum (R\u00F6ding, 1798)" . "(For the tree oyster mushroom, see Pleurotus ostreatus.)Isognomon is a genus of marine bivalve mollusks which is related to the pearl oysters.Isognomon is known in the fossil record from the Permian period to the Quaternary period (age range: 254.0 to 0.012 millions years ago). Fossils of species within this genus have been found all over the world."@en . "* Isognomon (Melina) (Philipsson, 1788)" . . . . "* Isognomon (Isognomon) (Lightfoot, 1786)" . . "* Pernaria (Rafinesque, 1815)" . . "* Isognomon (Anisoperna) (Iredale, 1939)" . "* Melina (Philipsson, 1788)" . "* Perna (Brugui\u00E8re, 1789)" . . "Isognomon"@en .