|Caecum cooperi S. Smith, 1860 Cooper's Caecum|
|North Myrtle Beach, South Carolina (5 mm.). Digital image by David Kirsh.|
|Scanning Electron Micrograph (SEM) Of Fossil Specimen|
Lower Pinecrest beds, Upper Tamiami Formation, Sarasota County, Florida (3.58 mm.). SEM produced in collaboration with Dr. Ann Heatherington, Dept. Geological Sciences, University of Florida, Gainesville, FL.