Английская Википедия:Echioceratidae

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Шаблон:Short description Шаблон:Automatic taxobox

Echioceratidae is an extinct family of ammonites that lived during Sinemurian stage of Early Jurassic.[1]

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. [1]

Genera and subgenera

Following genera are members of this family:[1]

Distribution

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]

References

Шаблон:Reflist

Шаблон:Portal Шаблон:Taxonbar


Шаблон:Ammonitina-stub

  1. 1,0 1,1 1,2 1,3 M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
  2. The Paleobiology Database