See text Collignociceras is a strongly ribbed and tuberculate, evolute ammonite from the Turonian of the western U.S. and Europe belonging to the ammonitid family Collignoniceratidae.

The type is Collignoniceras woollgari, named by Mantell in 1822 for specimens from Sussex, England.

The shell is compressed in early growth stages, with rounded or high and clavate siphonal tubercles tending to form a serrate keel, straight or slightly sinuous ribs and weak umbilical and strong ventrolateral tubercles.

The slightly younger C. w. regulari is known from the lower Carlile Shale, which overlies the Greenhorn.

It has been found in U. S. western interior from as far west as northern Arizona and eastern Utah and from New Mexico to Montana.