In South Philadelphia, where I work. There is a group of lakes in a picnic park. There is always a lot of turtles basking at the end of one of the lakes, where all kinds of debris piles up. There is one turtle I can't identify. The shell is black and smooth just like a painted, but thicker and more boxy like a mud turtle, there is a very prominent red ear slash just like an RES, but has the yellow pinstriping on the neck like a painted. Many times I'll see many varities basking. RES, Eastern painteds, Muds, I even saw a Diamondback Terrapin once(obviously very blind but apparently quite healthy), and the turtle I just described. And there is not just one of them. There's a couple of them of different sizes. Any ideas? Checker.