I don't think its a north american mud turtle species because the plastron doesnt appear to be hinged. But I'm stumped. I was suspecting african mud or helmted turtle
It can't be Kinosternon without there being two hinges on the plastron. This turtle has zero plastral hinges.
diamondbp is the best aquatic ID person here, and he is stumped as well. No offense to my friend Gerard.
Some geographic information would do wonders for the proper IDing of this turtle. I'm sure this animal was not purchased at a pet store in Little Rock if you catch my drift.
Where is the op? We need to know where on earth this guy came from . Where is Gerrards its like talking sulcata with out Tom . The world may never know!