Biology:Barroisiceras

Short description: Genus of molluscs (fossil)

Barroisiceras Temporal range: Coniacian PreЄ Є O S D C P T J K Pg N ↓
Fossil of Barroisiceras species. Coniacian of Madagascar
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Collignoniceratidae
Subfamily:	†Barroisiceratinae
Genus:	†Barroisiceras de Grossouvre, 1894
Subgenera
Barroisiceras (Alstadenites) Barroisiceras (Barroisiceras) Barroisiceras (Texasia)

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

References

Notes

Bibliography

• Arkell et al., 1957. Mesozoic Ammonoidea Treatise on Invertebrate Paleontology part L, Ammonoidea.

Wikidata ☰ Q9166005 entry