It seems that a species that has been delisted as an endangered species has also been delisted from the official list of species that have been delisted. Here's the story (so far).
While working on my forthcoming symposium article evaluating the first fifty years of the Endangered Species Act (ESA), I looked at the number of species that have been designated as endangered or threatened species under the Act, as well as those that have been "delisted." Species are delisted either because they are no longer threatened or endangered (i.e. they have recovered), because they went extinct, or because they never should have been listed in the first place (perhaps due to a data error of some sort).
The Fish and Wildlife Service maintains data on species listing and delisting in its ECOS database.
