A common, medium-sized, semiaquatic turtle. The upper portion of the shell, the carapace, tends to be oval-shaped with sharp edges. The carapace is rough with indentations that vary in direction. The bottom of the shell, the plastron, is flat and smooth. The coloring of the carapace ranges from greenish yellow to gray, brown, and black. Large, yellow lines are often present on the carapace. The plastron tends to be lighter in color than the carapace, and it is usually yellow with black spots or streaks. The skin is dark green and brown.