Arietites, Print, 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 triplicate, 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

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Arietites, Print, 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 triplicate, 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.

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Photo credit: © Artokoloro / Alamy / Afripics
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Keywords: ammonites, arietites, arietitidae, evolute, family, fossils, genus, giant, grooves, jurassic, keels, longitudinal, massive, pair, print, psiloceratacean, ribbed, run, separated, sinemurian, stage, subquadrate, transversely, triplicate, venter, whorls, wide, world