Biology:Nannolytoceras
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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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| Order: | Lytoceratida
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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
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] Slovakia,[6] and France.[7]
References
- ↑ 1.0 1.1 Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology 363: 1–560. http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class. Retrieved 2017-10-18.
- ↑ Ammonites Nannolytoceras - Nannolytoceras tripartitum
- ↑ 3.0 3.1 Ammonites.fr
- ↑ Redjaen
- ↑ 5.0 5.1 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. https://www.researchgate.net/publication/236620505_Ammonoid_succession_at_the_Bajocian-Bathonian_transition_in_the_Bas_Auran_area_Digne_District_South-East_France.
Wikidata ☰ Q12264690 entry
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