Theliderma stapes, the stirrup shell or stirrupshell, was a species of bivalve in the family Unionidae.

It was last observed in 1987 and was proposed for delisting due to extinction by the US Fish and Wildlife Service in 2021.

[8] This species experienced a population collapse primarily due to river modification in the form of canal construction.

Freshly dead shells of this species were last observed in 1987 and further surveys have failed to find any evidence of a surviving population.

This is done when further efforts to recover a species would almost certainly be futile, and there is no evidence of currently surviving individuals.