Turrilites costatus

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

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:	†Ammonitida
Suborder:	†Ancyloceratina
Family:	†Turrilitidae
Genus:	†Turrilites
Species:	†T. costatus
Binomial name
†Turrilites costatus Lamarck, 1801

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.