Turrilites costatus

Turrilites costatus; Temporal range: Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N
	Turrilites costatus from Rouen, France, on display at Galerie de paléontologie et d'anatomie comparée, Paris
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ancyloceratina ?
Superfamily:	Turrilitoidea
Family:	Turrilitidae
Genus:	Turrilites
Subgenus:	Turrilites (Turrilites)
Species:	T. T. costatus
Binomial name
	Turrilites (Turrilites) costatus; Lamarck, 1801

Turrilites (Turrilites) costatus is a species of helically coiled ammonoid cephalopod, from the lower part of the Upper Cretaceous (Cenomanian).

Description

The shell of this species can reach a length of about 11 centimetres (4.3 in). It is tightly wound in a high trochospiral, with an acute angle at the apex. Ribs are weak, with rows of strong tubercles.

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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
Ammonites

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