The full dark spots on the underside of the marginal help to distinguish it from the Florida Cooter (Pseudemys floridana floridana), which has spots with light colored centers.

1st & 2nd photo: Immokalee area, Florida, USA, 23 November 2012
3rd & 4th photo: Bailey Tract, Sanibel Island, Florida, USA, 22 November 2012
5th photo: Merritt Island, Florida, USA, 23 March 2022