Nannolytoceras

Nannolytoceras
Temporal range: Bajocian–Bathonian
Fossil shells of Nannolytoceras tripartitum from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Nannolytoceratidae
Genus: †Nannolytoceras
Buckman, 1905

Nannolytoceras is an extinct genus of lytoceratid ammonite, family Lytoceratidae, with a stratigraphic range extending from the Bajocian age to Bathonian age (Medium Jurassic).

Description

Shells of Nannolytoceras species reach a diameter of about 46–75 millimetres (1.8–3.0 in). The shell is evolute, smooth, tubular to compressed, with a variable number of more or less regularly spaced deep constrictions. The very thin ribs crossing the ventral region are barely visible. Umbilicus is relatively large. The suture line is of ammonitic type. These cephalopods were fast-moving nektonic carnivores.

Distribution

Fossils of species within this genus have been found in the Jurassic rocks of Italy, Spain, Slovakia, and France.

References

  1. 1 2 Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Retrieved 2017-10-18.
  2. ↑ Ammonites Nannolytoceras - Nannolytoceras tripartitum
  3. 1 2 Ammonites.fr
  4. ↑ Redjaen
  5. 1 2 Paleobiology Database - Nannolytoceras. 2017-10-19.
  6. ↑ Schlögl Ján (2001). Sedimentológia a biostratigrafia červených hľuznatých vápencov čorštýnskeho súvrstvia ("Ammonitico Rosso") v pieninskom bradlovom pásme.
  7. ↑ Pavia, Giulio; Fernández-López, Sixto; Mangold, Charles (2008-07-01). "Ammonoid succession at the Bajocian-Bathonian transition in the Bas Auran area, Digne District, South-East France". Rivista Italiana di Paleontologia e Stratigrafia. 114: 287–311. doi:10.13130/2039-4942/5903.