Rare Heteromorph from France, Acrioceras tabarelli

Description

Ammonoidea, Ancyloceratidae, Acrioceras tabarelli, (Astier, 1851)
This specimen was repaired during preparation. Great preservation in this rare specimen. Other localities do not preserve in aragonite like the specimens from Castellane.
This specimen is an example of species sexual dimorphism. Acrioceras tabarelli is a smaller  microconch (m) or male form of
Emericeras emerici
the larger
macroconch (M) or
female of the species.
Emericeras emerici is a synonym of Crioceratites emerici, which will be offered for sale in the future.
Castellane, Alpes-de-Haute-Provence, France
Cretaceous, Lower Barremian, hugii zone 129 Mya
Specimen with matrix is 120 mm x 105 x 50 mm