# Arietitidae

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{{Short description|Extinct family of ammonites}}
{{Automatic taxobox
| fossil_range = [Lower Jurassic](/source/Lower_Jurassic), {{fossilrange|Sinemurian|Pliensbachian}}
| image = Arietitidae - Asteroceras stellare.JPG
| image_caption = ''[Asteroceras stellare](/source/Asteroceras)''
| taxon = Arietitidae
| authority = [Hyatt](/source/Alpheus_Hyatt), 1874
| subdivision_ranks = Subfamilies
| subdivision =
* [Alsatitinae](/source/Alsatitinae)
* [Arietitinae](/source/Arietitinae)
* [Agassiceratinae](/source/Agassiceratinae)
* [Pseudotropitinae](/source/Pseudotropitinae)
* [Asteroceratinae](/source/Asteroceratinae)
* [Hypasteroceratinae](/source/Hypasteroceratinae)
}}

'''Arietitidae''' is a family of true ammonites that make up part of the superfamily [Psiloceratoidea](/source/Psiloceratoidea), named after the type genus ''[Arietites](/source/Arietites)''. They comprise medium-size to large or gigantic genera which in general are strongly ribbed, tuberculate in some, with keeled or grooved and keeled venters, and well differentiated ammonitic sutures. The aptycus is single valved with a shiny, concentrically striated surface.

Arietitidae dominated [Lower Jurassic](/source/Lower_Jurassic), [Sinemurian](/source/Sinemurian) ammonites, worldwide, extending into the lower [Pliensbachian](/source/Pliensbachian).

The Arietitidae may have their origin in the  [Schlotheimiidae](/source/Schlotheimiidae) if not directly from the [Psiloceratidae](/source/Psiloceratidae), and is the probably source for the [Oxynoticeratidae](/source/Oxynoticeratidae).

==References==
*{{cite book| first1=W.J. |last1=Arkell |first2=B. |last2=Kummel |first3=C.W. |last3=Wright |series=Treatise on Invertebrate Paleontology, Part L, Mollusca 4| title=Mesozoic Ammonoidea | publisher=Geological Society of America and University of Kansas Press |location=Lawrence, Kansas|year=1957}}
* Donvan, D.T. and Callomon, J.H. 1981, Classification of the Jurassic Ammonitina., in The Ammonoidea, The Systematics Association Special Volume 18.

{{Taxonbar|from=Q4790516}}

Category:Arietitidae
Category:Ammonitida families
Category:Psiloceratoidea
Category:Sinemurian first appearances
Category:Early Jurassic extinctions

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Adapted from the Wikipedia article [Arietitidae](https://en.wikipedia.org/wiki/Arietitidae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Arietitidae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.