Skirroceras macrum

Skirroceras macrum Temporal range: Jurassic (Bajocian), 171.6–167.7  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ [1]
Fossil of Skirroceras macrum from France, on display at the Museo Civico di Storia Naturale di Milano
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	† Ammonoidea
Order:	† Ammonitida
Family:	† Stephanoceratidae
Genus:	† Skirroceras
Species:	†S. macrum
Binomial name
†Skirroceras macrum (von Quenstedt)

Skirroceras macrum is a Stephanoceratacean (ammonite) species belonging to the family Stephanoceratidae.

These fast-moving nektonic carnivores lived during the Jurassic period, in the Bajocian age. ^[2]

Description

Skirroceras macrum has an evolute shell reaching about 11.5 centimetres (4.5 in) of diameter. These ammonites are heavily ribbed, with characteristic nodes.

Distribution

Fossils of Skirroceras macrum are found in the Middle Jurassic Bajocian age marine strata of England and France. ^[3]

References

1. The Paleobiology Database
2. Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
3. Discover Yale

• P. E. BARTOK, O. RENZ and G.E.G. WESTERMANN The Siquisique ophiolites, Northern Lara State, Venezuela: A discussion on their Middle Jurassic ammonites and tectonic implications

External links

• UK Fossils