Elimia gibbera
Elimia gibbera, the shouldered elimia, is a species of freshwater snails in the family Pleuroceridae. This species was endemic to Alabama, the United States, with records from the Coosa River. It is now considered extinct, the attributed cause is land-use change. Already in 1936, Calvin Goodrich wrote that "To a large extent, the goniobasic fauna of the Coosa Biver must be spoken of in the past tense".