Peninsular Cooter vs. River Cooter

River Cooters share the rivers and spring runs of south Georgia and north Florida with the Peninsular Cooter. A: Plain yellow, no dark marks along the seams in the Peninsular Cooter; dark marks along the seams in the River Cooter. B: Wavy yellow lines and bars; no C-shaped mark in the Peninsular Cooter; a yellow C-shaped mark on the second side plate in the River Cooter. C: Stripes bending into hairpin loops on top of the head in the Peninsular Cooter; many thin yellow stripes, without hairpins in the River Cooter. Old cooters darken, which hides the shell marks: the lower shell and head stripes stay the surest guide.

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

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