Nannolytoceras
| Nannolytoceras Temporal range:
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| Fossil shells of Nannolytoceras tripartitum from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
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| Genus: | Nannolytoceras Buckman, 1905
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Nannolytoceras is an extinct genus of lytoceratid ammonite, family Lytoceratidae, with a stratigraphic range extending from the Bajocian age to Bathonian age (Medium Jurassic).[1]
Description
[edit]Shells of Nannolytoceras species reach a diameter of about 46–75 millimetres (1.8–3.0 in).[2][3] The shell is evolute, smooth, tubular to compressed, with a variable number of more or less regularly spaced deep constrictions.[3] The very thin ribs crossing the ventral region are barely visible. Umbilicus is relatively large. The suture line is of ammonitic type.[4] These cephalopods were fast-moving nektonic carnivores.[5]
Distribution
[edit]Fossils of species within this genus have been found in the Jurassic rocks of Italy, Spain,[5] Slovakia,[6] and France.[7]
References
[edit]- ^ a b Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Retrieved 2017-10-18.
- ^ Ammonites Nannolytoceras - Nannolytoceras tripartitum
- ^ a b Ammonites.fr
- ^ Redjaen
- ^ a b Paleobiology Database - Nannolytoceras. 2017-10-19.
- ^ Schlögl Ján (2001). Sedimentológia a biostratigrafia červených hľuznatých vápencov čorštýnskeho súvrstvia ("Ammonitico Rosso") v pieninskom bradlovom pásme.
- ^ 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.
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