Biology:Barroisiceras
Barroisiceras | |
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Fossil of Barroisiceras species. Coniacian of Madagascar | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Ammonitida |
Family: | †Collignoniceratidae |
Subfamily: | †Barroisiceratinae |
Genus: | †Barroisiceras de Grossouvre, 1894 |
Subgenera | |
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Barroisiceras is an acanthoceratacean ammonite from the Upper Cretaceous, Coniacian,<ref name="Sepkoski Ceph">{{cite web
Diagnosis
The shell of Barroisiceras is rather involute, coiled such that the outer whorl embraces much of the previous, and is generally compressed. Whorls are high with a strong crenulate keel and sparse umbilical tubercles that develop into pairs of commonly flat ribs.
Taxonomy
Barroisiceras is divided two subgenera, Barroisiceras (Barroisiceras) and Barroisiceras (Texasia),with Alstadenites sometimes added as a third, Barroisiceras (Alstadenites). B. (Barroiciceras) is moderately involute and the suture is rather simple. B. (Texasia) is more evolute and has a distinctly eccentric umbilicus and more complex suture.
Distribution
Cretaceous of Austria, Czechoslovakia, France, Hungary, Italy, Japan, Morocco, Slovakia, Spain, Trinidad and Tobago and USSR [2]
References
- Notes
- Bibliography
- Arkell et al., 1957. Mesozoic Ammonoidea Treatise on Invertebrate Paleontology part L, Ammonoidea.
Wikidata ☰ Q9166005 entry
Original source: https://en.wikipedia.org/wiki/Barroisiceras.
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