Big Bend Slider vs. False Map Turtle

Both are basking turtles with a mark behind the eye; they meet in Texas rivers (records share 2 one-degree squares). A: A big orange spot edged black in the Big Bend Slider; a small yellow crescent or spot among thin yellow lines in the False Map Turtle. The False Map Turtle's shell has a saw-toothed keel of dark knobs down the middle; the Big Bend Slider's is smooth.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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