Durotrigensia

Durotrigensia Temporal range: Bajocian[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 a genus of ammonites (Ammonitida) in the perisphinctoid family Parkinsoniidae.

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

These large to giant ammonites have sharp and finely ribbed inner whorls and smooth outer whorls, without tubercles or lappets.

References

1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. {{cite journal}}: Cite journal requires |journal= (help)

• 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