Echioceratidae Temporal range: Sinemurian, [1]
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Fossil shells of Echioceras raricostatum from Pierreclos (France), on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Ammonitida |
Suborder: | †Ammonitina |
Superfamily: | †Psiloceratoidea |
Family: | †Echioceratidae Buckman, 1913 |
Echioceratidae is an extinct family of ammonites that lived during Sinemurian stage of Early Jurassic.[1]
Ammonites belonging to this family are characterised by serpenticone shells with a keel, which can be surrounded by grooves if a species is densely ribbed and compressed. The whorl section is either circular or has flat sides. Ribs are simple and strong with the exception of Leptechioceras which instead possessed a strongly compressed, smooth outer whorl. The initial ontogenical stage of these ammonites is typically smooth but very short. Tubercules are represented in a few genera within this group. [1]
Following genera are members of this family:[1]
Fossils of species within this family have been found in the Jurassic rocks of north Africa, South and North America, Europe and Asia.[2][1]