In the 1970s, the discovery of the Tennessee snail darter in the Tellico River was used to halt completion of the Tellico Dam under the Endangered Species Act (a tale many law students learn in TVA v. Hill). The dam was only completed after Congress expressly exempted it from the ESA’s dictates.
It has long been understood that the snail darter was the right species at the right time, as it gave dam opponents a powerful legal weapon. Now, the New York Times reports, it turns out the snail darter was not really the right species, as it is not a distinct species at all.
“There is, technically, no snail darter,” said Thomas Near, curator of ichthyology at the Yale Peabody Museum.
Dr. Near, also a professor who leads a fish biology lab at Yale, and his colleagues report in the journal Current Biology that the snail darter, Percina tanasi, is neither a distinct species nor a subspecies. Rather, it is an eastern population of…
