Devils Hole pupfish

The Devils Hole pupfish (Cyprinodon diabolis) is a species of fish native to Devils Hole, a geothermal aquifer-fed pool within a limestone cavern, in the Ash Meadows National Wildlife Refuge east of Death Valley. It has been described as the world's rarest fish, with a population of fewer than 200 since 2005. Genetic analysis indicates that the species evolved at the same time the cavern opened up to the surface, about 60,000 years ago.

Devils Hole pupfish

The Devils Hole pupfish (Cyprinodon diabolis) is a species of fish native to Devils Hole, a geothermal aquifer-fed pool within a limestone cavern, in the Ash Meadows National Wildlife Refuge east of Death Valley. It has been described as the world's rarest fish, with a population of fewer than 200 since 2005. Genetic analysis indicates that the species evolved at the same time the cavern opened up to the surface, about 60,000 years ago.