Barroisiceras
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| Barroisiceras Temporal range: | |
|---|---|
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| 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[2] | |
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Barroisiceras is an acanthoceratacean ammonite from the Upper Cretaceous, Coniacian,[1] included in the family Collignoniceratidae.
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.
