Scientists say the snail darter, whose endangered species status delayed the building of a dam in Tennessee in the 1970s, is a genetic match of a different fish.

Senator Howard Baker of Tennessee described an “awful beast” in 1979. That beast—which he also called “the bane of my existence, the nemesis of my golden years, the bold perverter of the Endangered Species Act”—was none other than the snail darter,

A team of ecologists, evolutionary biologists and resource managers affiliated with several institutions across the U.S. has found that the snail darter, which was famously used by environmentalists in the 1970s to block construction of a damn,