Alasmidonta undulata (Say, 1817)  

Family: Unionidae

triangle floater

[Alasmodonta sculptilis Say, 1829, moreUnio hians Valenciennes, 1821, Unio swainsoni Sowerby, 1868, Unio undulata Say, 1817, Uniopsis mytiloides Swainson, 1840]