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Temporal range: Sinemurian[1]
Arietites bucklandi.jpg
Arietites bucklandi
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Superfamily: Psiloceratoidea
Family: Arietitidae
Genus: Arietites
Waagen, 1869


Arietites bucklandi fossil at the Geological Museum in Copenhagen

Arietites is a genus of massive, giant evolute, psiloceratacean ammonites in the family Arietitidae in which whorls are subquadrate and transversely ribbed and low keels in tripicate, separated by a pair of longitudinal grooves, run along the venter. Fossils are known world wide from the lower Sinemurian stage of the Lower Jurassic.

Similar genera include Megarietites in which the keels are reduced and Epammonites in which the ribs are more closely spaced.


  1. ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. 
  2. ^ [ Arietites] at

Further reading[edit]

  • Arkell, et al. 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology. Geological Soc. of America and Univ. of Kansas Press.