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

• W.J Arkell, et al. 1957, Mesozoic ammonoidea; Treatise on Invertebrate Paleontology, Part L, (L333-334). Geological Society of America and University of Kansas Press.
• Sepkoski's list of Cephalopod genera [1]