Notes on the Fauna of the Chipola Formation- XXXIV New Species of Cancellarioidea (Mollusca: Gastropoda)

Abstract

Five new species of Trigonostoma (Gastropoda: Cancellarioidea) are described from the Miocene Chipola Formation of Calhoun County, Florida. These new species are assigned to the genus Trigonostoma sensu lato pending additional study of cancellariid phylogeny. The new species are: Trigonostoma xiphion, T. serilium, T. ritteri, T. nexum, and T. proteus. Also, two new species of Axelella (Gastropoda: Cancellarioidea) are described from the same formation. These new species are Axelella firma and A. axiologa.