Lyelliceras

Lyelliceras is a genus of ammonites belonging to the family Lyelliceratidae. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period, Albian stage (109.0 to 99.7 Ma).[1][2]

Lyelliceras
Temporal range: Albian
~109.0–99.7 Ma
Fossil of Lyelliceras lyelli from Peru
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Superfamily:
Acanthoceratoidea
Family:
Lyelliceratidae
Genus:
Lyelliceras

Spath 1921

See text

Etymology

The genus has been named after geologist Charles Lyell.

Description

Shells of Lyelliceras species can reach a diameter of about 50 millimetres (2.0 in). They are moderately to very evolute. The section of the whorls is slightly compressed or circular, with straight radial ribs.[3][4]

Species

The following species have been recognised:[1]

  • Lyelliceras escragnollensis Kennedy, 2011
  • Lyelliceras latili Kennedy and Klinger, 2008
  • Lyelliceras lyelli (d'Orbigny, 1841)
  • Lyelliceras pseudolyelli Parona and Bonarelli, 1897
  • Lyelliceras vaasti Destombes et al., 1973

Distribution

Fossils of species within this genus have been found in the Cretaceous sediments of Colombia (Hiló Formation, Tolima), France, Madagascar, Mexico, Peru, South Africa, United Kingdom, United States and Venezuela.[1]

References
  1. Lyelliceras at Fossilworks.org
  2. Sepkoski, Jack Sepkoski's Online Genus Database - Cephalopodes
  3. Crioceratites
  4. Ammonites


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