Theliderma_stapes
Theliderma stapes
Species of bivalve
Theliderma stapes, the stirrup shell or stirrupshell, was a species of bivalve in the family Unionidae. It was endemic to eastern Mississippi and western Alabama in the United States. It was last observed in 1987 and was proposed for delisting due to extinction by the US Fish and Wildlife Service in 2021.[1][6][7] It was officially declared extinct on October 16, 2023.[8]