Aorotrema cistronium (Dall, 1889a) Three-keel Vitrinella Scanning Electron Micrograph

Aorotrema cistronium (Dall, 1889a) Three-keel Vitrinella Scanning Electron Micrograph

    Lower Pinecrest beds, Upper Tamiami Formation, Sarasota County, Florida (1.32 mm.). SEM produced in collaboration with Dr. Ann Heatherington, Dept. of Geology, University of Florida, Gainesville, FL.