ThelidermaTheliderma is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae. They are native to North America.This genus is sometimes classified in an expanded Quadrula.Species within the genus ''Theliderma''Note: Taxa with a "†" symbol are extinct due to human activityTheliderma cylindrica - RabbitsfootTheliderma intermedia - Cumberland monkeyfaceTheliderma metanevra - MonkeyfaceTheliderma sparsa - Appalachian monkeyface †Theliderma stapes - Stirrup shell †Theliderma tuberosa - Rough rockshell