Nannolytoceras

Nannolytoceras
Temporal range: Bajocian–Bathonian[1]
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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
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Lytoceratida
Suborder: Lytoceratina
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).[1]

Description

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

Fossils of species within this genus have been found in the Jurassic rocks of Italy, Spain[5] and Slovakia.[6]

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.


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