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Northern Map Turtle vs. Ouachita Map Turtle

The spot behind the eye: Northern Map Turtle — a small oval spot; Ouachita Map Turtle — a large square spot, with more spots below the eye and on the chin. The ridge on the shell: Northern Map Turtle — one low, smooth ridge or a ridge with knobs or bumps along it; Ouachita Map Turtle — a ridge with knobs or bumps along it (these overlap, so it only helps).

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Northern Map Turtle

Graptemys geographica

Ouachita Map Turtle

Graptemys ouachitensis
Northern Map Turtle vs. Ouachita Map Turtle: comparison sheet with the differences marked

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

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