About Graptemys pseudogeographica (Gray, 1831)
Graptemys pseudogeographica, commonly called the false map turtle or sawback turtle, has a carapace with a vertebral row of low spines, and its posterior rim is serrated. The carapace ranges in color from olive to brown, and has light yellowish markings bordered by dark edges, with a dark mark often present on each scute. The plastron’s color varies from cream to yellow, and juveniles have dark lines patterned along the plastron seams. The body of the false map turtle is grayish brown to blackish, marked with light brown, yellow, or whitish stripes. The eye may be brown, light yellow, white, or green, and is crossed by a dark bar. A distinct "L" shaped mark can appear just behind each eye. Narrow hooked marks behind the eye fuse with dorsal lines on the head and neck. Small light-colored spots also occur below the eye and on the chin. This species lives in large streams of the Missouri and Mississippi River systems, with a range extending from Ohio, Indiana, Illinois, Wisconsin, Minnesota, through the Dakotas, south to southwestern Alabama, southern and western Mississippi, and Louisiana. It also inhabits several other river systems in Southwest Louisiana and East Texas. The false map turtle is a strong swimmer that prefers rivers and large creeks with moderate currents, that contain aquatic vegetation plus snags or floating logs. It tolerates deep, swift water well. It can be found in oxbow lakes and sloughs, but does not occur in lakes, ponds, or small streams. Basking is an important behavior for these turtles, and they can even be found on steep, slippery snags.
