razor backed musk turtle tortoise sternotherus carinatus

animal reptile turtle amphibian lizard wildlife tortoise fish snake frog serpent crocodile razor backed musk sternotherus carinatus razor-backed species family kinosternidae native southern united states grows straight carapace length brown-colored black markings edges scute distinct sharp keel center giving common name body typically grey-brown color spotting head bulbous shape long neck short legs beak males distinguished females longer tails plastron small hinge located anteriorly gular barbels present chin