⚠ Aquatic. Reticulated ⚠ carapace with second ⚠ scute forming a "C". Back margin of ⚠ carapace serrate and flaring. Underside of marginal ⚠ scutes usually with dark "doughnuts". ⚠ Plastron plain yellow. Chin flat.
⚠ Terrestrial. ⚠ Carapace forms rounded dome and is typically plain brown (though sometimes with a radiating pattern). ⚠ Plastron plain (though sometimes with dark marks outlining ⚠ scutes). Hind foot with 3 (or 4) toes. Juveniles with prominent ⚠ middorsal⚠ keel.
Rare. ⚠ Terrestrial. ⚠ Carapace forms flattened dome with radiating pattern. ⚠ Plastron marked boldly with reticulation of black and yellow. Hind foot with 4 toes. Juveniles with prominent ⚠ middorsal⚠ keel.
⚠ Aquatic. Prominent red "ear" behind eye. Reticulated, greenish ⚠ carapace with back margin somewhat serrate and flaring. Underside of marginal ⚠ scutes plain. ⚠ Plastron with usually one dark "doughnut" per ⚠ scute.
Family: Kinosternidae (Mud and Musk Turtles)
Genera: Kinosternon (American Mud Turtles) and Sternotherus (Musk Turtles)
⚠ Aquatic. Pancake-shaped with long neck and snorkel nose. ⚠ Carapace mostly without pattern and smooth. Front edge of ⚠ carapace without bumps. Nostrils without ridge-like projections. Feet not strongly patterned.
⚠ Aquatic. Pancake-shaped with long neck and snorkel nose. ⚠ Carapace with pattern of dots and sandpaper-like texture. Front edge of ⚠ carapace with bumps. Nostrils with ridge-like projections. Feet strongly patterned.
Subspecies: Pallid Spiny Softshell (A. s. pallida) and Eastern Spiny Softshell (A. s. spinifera)