Prodactylioceras is genus of ammonite that lived during the Pliensbachian stage of early Jurassic. It has evolved from Reynesocoeloceras, but maybe not directly, but through Bettoniceras. Its fossils were found in Europe, Asia and North America.[1]
| Prodactylioceras Temporal range: [1]
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|---|---|
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| P. davoei - type species of genus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Dactylioceratidae |
| Subfamily: | †Reynesocoeloceratinae |
| Genus: | †Prodactylioceras Spath, 1923 |
| Type species | |
| Ammonites davoei Sowerby, 1822
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| Species | |
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| Synonyms | |
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While sometimes, genus Bettoniceras, which differs from Prodactylioceras only by lacking tubercules is considered valid,[1] in other cases it is considered to be a synonym of this genus.[2] Species as P. italicum, or P. colubriforme would not be in that case belonging to this genus, as they are members of genus Bettoniceras.[3]
Description
editAmmonites of this genus had evolute shells, with circular to slightly depressed whorl section. In compressed species, ribs were fine and often prorsiradiate and they were wearing ventrolateral tubercules. In depressed species, ribs are coarser and swollen, while ventrolateral tubercules are larger.[1]
References
edit- ^ a b c d M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.
- ^ Meister, C., Dommergues, J. L., Dommergues, C., Lachkar, N., & El Hariri, K. (2011). Les ammonites du Pliensbachien du jebel Bou Rharraf (Haut Atlas oriental, Maroc). Geobios, 44(1), 117-e1.
- ^ Wiedenmayer, F. (1980). Die Ammoniten Der Mediterranen Provinz Im Pliensbachian Und Unteren Toarcian Aufgrund Neuer Untersuchungen Im Generoso-Becken: Lombardische Alpen (Vol. 93). Birkhauser.
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