|Acteocina sphalera Gardner, 1937 Extinct Fossil|
|Scanning Electron Micrographs (SEM) of fossil specimens|
Lower Pinecrest beds, Upper Tamiami Formation, Sarasota County, Florida (top left and bottom 3.38 mm. and 3.54 mm. for the top right specimen). SEMs produced in collaboration with Dr. Ann Heatherington, Dept. of Geology, University of Florida, Gainesville, FL.