Durotrigensia is a genus of ammonites (Ammonitida) in the perisphinctoid family Parkinsoniidae.
Durotrigensia Temporal range:
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Fossil of Durotrigensia species from France, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Ammonitida |
Family: | †Parkinsoniidae |
Genus: | †Durotrigensia Buckman, 1928 |
Species | |
see text |
Durotrigensia is sometimes considered a subgenus of Parkinsonia and is related also to Oraniceras and Okribites.
These cephalopods lived during the Bajocian stage of the Middle Jurassic some 170 to 164 million years ago.[1]
Description
editThese large to giant ammonites have sharp and finely ribbed inner whorls and smooth outer whorls, without tubercles or lappets.
References
edit- ^ a b Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
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- 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.
- Ammonites - Parkinsonia (Durotrigensia) sp. entry