Arnioceras is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edge where they swing forward and fade. The rim (venter) is keeled and free of grooves.
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| Arnioceras acuticarinatu | |
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| Genus: | Arnioceras Hyatt, 1897
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Arnioceras, named by Alpheus Hyatt, is included in the arietitid family of the Psiloceratoidea, an ammonitid superfamily. Its distribution is fairly worldwide, having been found in Europe, south Asia, and North and South America.[2]
References
edit- Notes
- ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2016-02-25. Retrieved 2017-10-18.
- ^ a b "Paleobiology Database - Arnioceras". Retrieved 2017-10-19.
- Bibliography
- Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
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