Glottoptychinites

Glottoptychinites
Temporal range: Late Jurassic (Tithonian)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Superfamily: Perisphinctaceae
Family: Perisphinctidae
Subfamily: Dorsoplanitinae
Genus: Glottoptychinites
Buckman, 1923

The shell, which grew to be rather large, is evolute, strongly and sharply ribbed. Ribbing is both simple and biplicate, with primary ribs bifurcating (splitting) on either flank before crossing the venter. The whorl section is round.

Glottoptychinites is similar in form to the closely related, strongly ribbed and evolute Pavlovia, Epipallasiceras, and Paravirgatites.


References

This article is issued from Wikipedia - version of the Thursday, July 24, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.