Acrioceras
Acrioceras is an extinct genus of cephalopods belonging to the ammonite subclass.[1]
| Acrioceras | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Suborder: | †Ancyloceratina |
| Family: | †Acrioceratidae |
| Genus: | †Acrioceras Hyatt 1900 |
| Type species | |
| Ancyloceras tabarelli (Astier 1851) | |
| Species | |
| |
%252C_Barremian%252C_Brestak%252C_(Coll._St._Breskovski)_at_the_Sofia_University_'St._Kliment_Ohridski'_Museum_of_Paleontology_and_Historical_Geology.jpg.webp)
Acrioceras tabarelli sarasini (Sarkar), Barremian, Brestak, (Coll. St. Breskovski) at the Sofia University Museum of Paleontology and Historical Geology
Description
A spire of one or two loosely coiled whorls followed by a short or long, straight or curved shaft, terminal hook, and short and or long final shaft. The ribs are generally fine and untuberculate, but sometimes the major ribs are enlarged and are carrying one to three tubercles. The ribs are single on the spire or the shaft but may branch from umbilical tubercles on the hook and the final shaft. The dorsum tends to become flat and the dorsolateral margin to become angular on the shaft and the hook.[1]
Distribution
Fossils of Acrioceras have been found in:[2]
- Barremian Formation, Brestak, Bulgaria
- Ono Formation, California
- Paja Formation, Colombia
- Barremian Provence, France
- Georgia
- Subway Formation, Germany
- Maiolica Formation, Italy
- Ishido and Inagoe Formations, Japan
- San Lucas Formation, Mexico
- Taboulouart Formation, Morocco
- Hauterivian Slovakia
- Makatini Formation, South Africa
- Hauterivian Murcia, Spain
References
- Wright, C. W. with Callomon, J.H. and Howarth, M.K. (1996), Mollusca 4 Revised , Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler ed.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, pp. 223, 224.
- "Acrioceras". Fossilworks. Retrieved 2 May 2022.
External links
- Wright, Claud William; with John Hannes Callomon and M.K. Howarth (1996). Roger L. Kaesler (ed.). Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L. Boulder, Colorado and Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p. 223-224.
{{cite book}}: CS1 maint: multiple names: authors list (link) - "Acrioceras". mindat.org. Retrieved 1 May 2022.
- "Acrioceras". PaleoBioDB (PBDB). Retrieved 1 May 2022.
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