Megalytoceratinae

Megalytoceratinae
Temporal range: Toarcian - Bajocian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Lytoceratida
Family: Lytoceratidae
Subfamily: Megalytoceratinae
Spath 1927
Genera

See text

Megalytoceratinae is a subfamily of lytoceratids ammonites consisting of planulate forms, i.e. those with moderately evolute compressed shells with bluntly rounded venters, in which the outer whorls become smooth and sutures tend to resemble those of the Perisphinctidae. The family includes two genera, Megalytoceras, and Metrolytoceras, from the Middle Bajocian of England and a third possible member, Asapholytoceras, from the Toacian of southeastern Europe.

References

This article is issued from Wikipedia - version of the 10/10/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.