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
Conservation status
Fossil
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Suborder:	Ammonitina
Superfamily:	Stephanocerataceae
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]

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

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

• 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

• UK Fossils

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