Lytoceratidae NEUMAYR, 1875


Faune

Dactylioceratidae

Couples

Eoderoceratidae

Liparoceratidae

Oxynoticeratidae

Juraphyllitidae

Lytoceratidae

Polymorphitidae

Family Lytoceratidae

It gathers together shells with circular, oval or subquadratic section and episodical constrictions. They are ammonites characterized by a fine and dense costulation, sometimes crenulated. Their stratigraphic distribution spreads out from the Sinemurian up to the Cretaceous period.

The whole Pliensbachian layers of Eastern Berry, Carixian and Domerian taken together, contain only two species.

Genus Lytoceras

It groups together forms with circular, oval or square sections and episodic constrictions. They are evolute ammonites with fine, dense and sometimes crenulated ribbing.

Genus Derolytoceras

Meister 1986, wrote about a possible sexual dimorphism Lytoceras - Derolytoceras. The last one seems to have in fact, all the characteristics of a microconch. It is a small form with circular whorls . The phragmocone is covered with fine, dense and crenulated ribs which thicken on the bodychamber.

No constrictions.

We are seeking.....
Derolytoceras aff. tortum m (Quenst.)
Lytoceras fimbriatum (Sowerby) M Ø 114 mm