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| Turrilites | |
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| Turrilites costatus fromRouen, France, on display atGalerie de paléontologie et d'anatomie comparée, Paris | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Suborder: | †Ancyloceratina |
| Family: | †Turrilitidae |
| Genus: | †Turrilites Lamarck, 1801 |
Turrilites is a genus of helically coiledammonoid cephalopods from the lower part of the Upper Cretaceous (Cenomanian andTuronian); generally included in theAncyloceratina. Previously (Arkell, 1957) it was included in the ammonoid suborder,Lytoceratina.
The shell ofTurrilites 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 fromMariella. Includes three subgenera.
Turrilites has three subgenera.
SubgenusTurrilites has weak ribs and strong tubercles. SubgenusEuturrilites has strong ribs, commonly depressed in middle, especially on early whorls, and no tubercles. SubgenusMesoturrilites has almost no ribs and clavate tubercles that tend to form spiral ridges.