Liparoceratidae HYATT, 1867










Family Liparoceratidae

In this Pliensbachian family has been classified very different ammonites of various aspects : on the one hand subspherical, involute ammonites with deep umbilicus, on the other hand "capricorn" and very evolute forms. In Berry, it is in the lower Pliensbachian deposits that the fauna is the richest. Liparoceratidae become rare from basal Domerian to give rise to Amaltheidae.

L. (Liparoceras) cheltiense (Murch.) M Ø 45mm
Metacymbites centriglobus (Opp.) m Ø 14 mm

Genus Metacymbites

This rather thick, dwarf microconch is almost smooth, but gentle ventral ribs may exist in the younger whorls. Its bodychamber is contracted and the aperture constricted, with small lappets.

Liparoceras and Metacymbites. are probably a dimorphic pair.

Genus Liparoceras

It is an involute ammonite with heavy whorls, coarse ribbing and two lines of tubercles.

L. (Becheiceras) gallicum M (Spath) Ø 82mm

Subgenus Becheiceras

Becheiceras resembles Liparoceras s. str. very much. However, the particularly fine ornamentation immediately separates the sub-genus from the genus.

Subgenus Beaniceras

The subgenus Beaniceras is characterized by its small size and its coarse ornamentation made up of ribs, tubercles and chevrons.

Ae. Beaniceras centaurus (d'Orb.) Ø 20mm
Ae. Beaniceras rotundum (Buck.) Ø 14mm
Ae. Beaniceras luridum (Simps.) Ø 20mm
Ae. Beaniceras crassum (Mou., Dom. & Roch.) Ø 21mm

Genus Androgynoceras

The shells of this group are characterized by two types of ornamentation. Indeed the inner whorls look like Aegoceras and the outer whorls like Liparoceras.

Genus Aegoceras

It belongs to "capricorn" Liparoceratidae which differ by their slowly coiling and their simplified ribbing. Some authors consider this genus as synonymous with Androgynoceras, but in France this ammonite is commonly known as Aegoceras.

Ae. (Aegoceras) capricornus (Schloth.) Ø 35 mm Ae. (Aegoceras) cf. lataecosta (Sow.) Ø 51mm
We are seeking.....
Liparoceras pseudostriatum (Truem.)
Ae. (Aegoceras) maculatum
(Y. & B.)
Androgynoceras sp.
Ae. (Oistoceras) crescens (Truem.) Ø 35 mm Ae. (Oistoceras) omissum (Simps.) Ø 37mm Ae. (Oistoceras) figulinum (Simps.) Ø 57mm

Subgenus Oistoceras

The subgenus Oistoceras has many affinities with the genus Aegoceras but it differs widely in its strongly marked ventral chevron.