Oppeliidae BONARELLI, 1894


Fauna

Lytoceratidae

Pairs

Pseudoperisphinctidae

Parkinsoniidae

Clydoniceratidae

Morphoceratidae

Phlycticeratidae

Sphaeroceratidae

Oppeliidae

Lissoceratidae

Phylloceratidae

Family Oppeliidae

The expansion of Oppelidae begins with the middle Jurassic to finish with the Cretaceous. The representatives of this family have a rather compressed shell (oxycone) and an ornamentation mainly made up of falcoid primary ribbing. The ammonites which belong to this group have a very vast geographical distribution which only excludes the boreal areas. In the Bathonian of the southern Paris basin, Oppeliidae are commun, except the genus Trimaginia.

Oxycerites aspidoides (Opp.) Ø 118 mm
Oxycerites seebachi (Wetz.) Ø 58 mm
Oxycerites limosus (Buck.) Ø 45 mm

Genus Oxycerites

This involute ammonite has an oxycone section and a keel. The ornementation first consists in falcate ribbing ; then the shell becomes smooth. The aperture is always simple.

We are seeking.....
Oxycerites pygmaea (Ark.)
Oxycerites fallax (Guér.) Ø 70 mm
O. (Oecotraustes) bomfordi (Ark.) Ø 35 mm

Genus Oecotraustes

In this genus you can find small and moderately involute species with falcate ribs. Some of them had a median groove and an aperture with small lappets. Oecotraustes and Oxycerites may be a dimorphic pair.

O. (Oecotraustes) nivernensis (de Gross.) Ø 52 mm
O. (Oecotraustes) decipiens (de Gross.) Ø 42 mm
O. (Oecotraustes) cf. bradleyi (Ark.) Ø 42 mm

Genus Eohecticoceras

Ammonite with discoidal shell, involute section, strong falcate ribbing and gentle tubercles on the venter.

Eohecticoceras primaevum (de Gross.) Ø 62 mm
O. (Paroecotraustes) cf. angustoides (Elmi) Ø 38 mm
Trimarginia sinaitica (Ark.) Ø 58 mm

Genus Trimarginia

This is a compressed and strongly involute ammonite with tricarinated venter. Its ornementation is the same as Oxycerites. Trimaginia is a tethysian genus.