Middle Pleistocene to Late Pleistocene; Recent.
Southern Florida to South Carolina.
For information on the modern distribution of the species, see WoRMS.
To access the original description (Agassiz, 1841) in its original formatting through the Biodiversity Heritage Library, click here.
- Late Pleistocene
- Anastasia Formation (S. FL)
- Fort Thompson Formation (S. FL)
- Middle Pleistocene
- Bermont Formation? (S. FL)
- Canepatch Formation (SC)