''Turrilites'' is a genus of helically coiled ammonoid cephalopods from the lower part of the Upper Cretaceous ( Cenomanian and

Turonian The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded ...

); generally included in the Ancyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder, Lytoceratina. The shell of ''Turrilites'' is tightly wound in a high trochospiral, with an acute angle at the apex. Ribs are weak to strong and may have 3 or 4 rows of equal numbers of tubercles. Thought to be derived from ''

Mariella ''Mariella'' is an ammonoid genus, named by Nowak (1916) from the upper Albian and Cenomanian stages of the mid Cretaceous, included in the Turrilitidae. Its type is ''Turrilites bergeri'' Description ''Mariella'' resembles ''Turrilites'' in ...

''. Includes three subgenera.

Subgenera and species

''Turrilites'' has three subgenera. * ''

Turrilites (Turrilites) ''Turrilites'' is a genus of helically coiled ammonoid cephalopods from the lower part of the Upper Cretaceous (Cenomanian and Turonian); generally included in the Ancyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder ...

'' Lamarck, 1801 ** ''Turrilites (Turrilites) acutus'' Passy, 1832 ** ''

Turrilites (Turrilites) costatus ''Turrilites (Turrilites) costatus'' is a species of helically coiled ammonoid cephalopod, from the lower part of the Upper Cretaceous (Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cret ...

'' Lamarck, 1801 ** ''Turrilites (Turrilites) scheuchzerianus '' Bosc, 1801 * ''

Turrilites (Euturrilites) ''Turrilites'' is a genus of helically coiled ammonoid cephalopods from the lower part of the Upper Cretaceous (Cenomanian and Turonian); generally included in the Ancyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder ...

'' Breistroffer, 1953 * ''

Turrilites (Mesoturrilites) ''Turrilites'' is a genus of helically coiled ammonoid cephalopods from the lower part of the Upper Cretaceous (Cenomanian and Turonian); generally included in the Ancyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder ...

'' Subgenus ''Turrilites'' has weak ribs and strong tubercles. Subgenus ''Euturrilites'' has strong ribs, commonly depressed in middle, especially on early whorls, and no tubercles. Subgenus ''Mesoturrilites'' has almost no ribs and clavate tubercles that tend to form spiral ridges.

References

* Arkell ''et al.'', Mesozoic Ammonoidea (L222); Treatise on Invertebrate Paleontology Part L, Ammonoidea. Geological Soc. of America and Univ Kansas Press.
The Paleobiology Database ''Turrilites'' entry
{{Taxonbar, from=Q4000713 Ammonitida genera Prehistoric cephalopod genera Cretaceous ammonites Cenomanian genus first appearances Turonian genus extinctions Ammonites of Africa Ammonites of Asia Ammonites of Australia Cretaceous ammonites of Europe Cretaceous ammonites of North America Ammonites of South America Taxa named by Jean-Baptiste Lamarck Fossil taxa described in 1801 Turrilitoidea