Alocolytoceras is a lytoceratid ammonite with whorls that pass during growth from round to oval, rounded-quadrate, or compressed; with about 19 deep constrictions per whorl, with as many as 21 sharp ribs in between. The shell is evolute. All whorls are visible from either side.
| Alocolytoceras Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Lytoceratidae |
| Subfamily: | †Alocolytoceratinae |
| Genus: | †Alocolytoceras Hyatt, 1900[2] |
Alocolytoceras belongs to the lytoceratid subfamily Alocolytoceratinae, which also includes Pachylytoceras and Pleurolytoceras. It is known from the upper Lower Jurassic of Europe and the Himalaya.
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.
- ^ "Paleobiology Database - Alocolytoceras". 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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