{{Short description|Extinct family of ammonites}} {{Automatic taxobox | fossil_range = Sinemurian, {{fossil range|196.5| 189.6 }}<ref name=Howarth2013/> | image = Echioceratidae - Echioceras raricostatum.JPG | image_caption = Fossil shells of ''Echioceras raricostatum'' from Pierreclos (France), on display at Galerie de paléontologie et d'anatomie comparée in Paris | display_parents = 2 | taxon = Echioceratidae | authority = Buckman, 1913 }}
'''''Echioceratidae''''' is an extinct family of ammonites that lived during Sinemurian stage of Early Jurassic.<ref name=Howarth2013/>
==Description== 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.<ref name=Howarth2013>M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.</ref>
==Genera and subgenera== Following genera are members of this family:<ref name=Howarth2013/>
* ''Palaeoechioceras'' <small>Spath, 1929</small> * ''Gagaticeras'' <small>Buckman, 1913</small> * ''Plesechioceras'' <small>Trueman and Williams, 1925</small> * ''Orthechioceras'' <small>Trueman and Williams, 1925</small> * ''Echioceras'' <small>Bayle, 1878</small> * ''Paltechioceras'' <small>Buckman, 1924</small> * ''Leptechioceras'' <small>Buckman, 1923</small> **''L. (Leptechioceras)'' **''L. (Neomicroceras)'' <small>Donovan, 1966</small>
==Distribution== Fossils of species within this family have been found in the Jurassic rocks of north Africa, South and North America, Europe and Asia.<ref name=fa>{{Cite web |url=https://www.fossilworks.org/ |title=The Paleobiology Database |access-date=2024-11-18 |archive-date=2022-03-25 |archive-url=https://web.archive.org/web/20220325060448/http://www.fossilworks.org/cgi-bin/bridge.pl?action=home |url-status=dead }}</ref><ref name=Howarth2013/>
==References== {{Reflist}}
{{Portal|Paleontology}} {{Taxonbar|from=Q18389125}}
Category:Psiloceratoidea Category:Ammonitida families Category:Early Jurassic ammonites of Europe Category:Ammonites of Europe Category:Ammonites of Africa Category:Ammonites of Asia Category:Ammonites of North America Category:Ammonites of South America Category:Sinemurian first appearances Category:Sinemurian extinctions
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