Two common River Cooter (Pseudemys concinna) turtle skulls measuring approximately 1-1/4 to 1-3/4 inches long and 1 inch wide. Turtle skulls can be used in Native American crafts, or for anyone that collects unusual items. The river cooter (Pseudemys concinna) is a freshwater turtle native to the central and eastern United States, from Virginia south to mid-Georgia, west to eastern Texas, Oklahoma, and north to southern Indiana. They are usually found in rivers with moderate current, as well as lakes and tidal marshes.