Phylum Mollusca Rank Genus | ||
Similar Michelinoceras, Cyrtoceras, Orthocerida, Monograptus, Orthocone | ||
Orthocycloceras is an extinct genus of actively mobile carnivorous cephalopods, essentially a Nautiloid, that lived in what would be Europe during the Silurian to Devonian from 428.2—412.3 mya, existing for approximately 15.9 million years.
Contents
Taxonomy
Orthocycloceras was assigned to Orthocerida Sepkoski (2002).
Morphology
The shell is usually long, and may be straight ("orthoconic") or gently curved. In life, these animals may have been similar to the modern squid, except for the long shell.
Fossil distribution
References
Orthocycloceras Wikipedia(Text) CC BY-SA