; order Chelonia, suborder Cryptodira)
A family of highly aquatic turtles that occur in fresh, brackish, and occasionally sea water. The bony shell is regressed, and covered with vascularized, respiratory skin. The head has a proboscis and fleshy lips. The limbs are oar-like. There are 25 species, occurring in N. America, Asia, and Africa.
Subjects: Zoology and Animal Sciences.