(Cyprinodon diabolis)
Cyprinodon diabolis ( Devil's Hole pupfish ),is an endangered fish species of the family Cyprinodontidae,living in the Devil's Hole in the Amargosa Desertin California's Death Valley.It is the smallest species ofdesert Cyprinodon,measuring on average 19 mm.It is also one of the most limited species of fish in the world: the only water hole that can be found is less than 10m.