Coahuilan box turtle

The Coahuilan box turtle (Terrapene coahuila), also known commonly as the aquatic box turtle, is an endangeredspecies of turtle in the familyEmydidae. Unlike the other members of the genusTerrapene, this turtle spends roughly 90% of its time in water.

It is a close relative to the common box turtle (Terrapene carolina). Researchers have therefore suggested that it developed from a nonaquatic species in order to survive in the desertsprings of Cuatro Ciénegas.