Laeviscyon planulatum (Dall, 1890)
Stratigraphy: Bed 4 Tamiami Formation
Location: SMR Phase 10 Pit, Sarasota County, Florida USA.
Notes: Almost identical to L. laevis but lacking a subsutural sulcus. Since both L. planulatum and L laevis are found in the same unit, the sulculus could be variation thus making L. laevis a synonym to L. planulatum.