| Berriasella | |
|---|---|
 | |
| Fossil shell ofBerriasella jabronensis fromGard (France), on display atGalerie de paléontologie et d'anatomie comparée in Paris | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Neocomitidae |
| Subfamily: | †Berriasellinae |
| Genus: | †Berriasella Uhlig, 1905 |
| Species | |
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Berriasella is a discoidal evoluteperisphinctaceanammonite, and type genus for theneocomitid subfamilyBerriasellinae. Its ribbing is distinct, consisting of both simple and bifurcated ribs that extend from the umbilical seam across the venter; its whorl section generally compressed, the venter more or less narrowly rounded. The speciesBerriasella jacobi traditionally has been regarded an index fossil defining the base of theCretaceous, however since 2016 this had been replaced by the first occurrence ofCalpionella alpina. Some authors regardB. jacobi as instead belonging to the genusStrambergella.[2]
Berriasella, named by Uhlig, 1905, is known from the lateUpper Jurassic,Tithonian, to the earlyLower Cretaceous,Berriasian and has a fairly worldwide distribution.[3]
Fossils ofBerriasella have been found in:
