Turritella trisulcata Lamarck, 1822: synonym of Turritella vermicularis
Turritella yucatecanum Dall, 1881: synonym of Turritella yucatecana (Dall, 1881)
Fossil species
The genus is known from the Cretaceous to the Recent periods.
The shells are quite frequently found as fossils, and the carbonate stone made from large quantities of Turritella shells is often referred to as "Turritella limestone", or, if silicified, "Turritella agate". Both varieties of this stone are commonly sold as polished cabochons.
"Turritella agate"
One variety of "Turritella agate", that from the Green River Formation in Wyoming, is a fossiliferous rock which does indeed contain numerous high-spired snail shells. However, contrary to the common name, these snails are not in the marine genus Turritella, instead they are freshwater snails in the species Elimia tenera, family Pleuroceridae from the Eocene epoch. The rock in which these snail shells are so abundant varies from a soft sandstone to a dense chalcedony. This dense silicified rock is popular with gem and mineral hobbyists, as well as with New Age practitioners.
Turritellenplatte
The Erminger Turritellenplatte ("Turritella plate of Ermingen") near Ulm, Germany is a rocky outcrop situated in the northern part of the North Alpine Foreland Basin. It is famous for its superabundance of Turritella turris shells within its sediments and dates from the Burdigalian.
