New research undertaken in the northern slopes of the Cheiron, near the village of Les Ferres (Alpes-Maritimes, France), resulted in the discovery of a rich ammonite fauna from the Lower Aptian Deshayesites deshayesi and Dufrenoyia furcata zones. This fauna is remarkable for the relatively large number of Ancyloceratidae, the vast majority of which corresponds to species belonging to genera whose presence was not or little recognized in the South-East of France. The study of these Ancyloceratidae led to the creation of the genus Caseyites gen. nov. represented by the new taxa C. esteronensis gen. nov. sp. nov., C. vermeuleni gen. nov. sp. nov. and C. morenobedmari gen. nov. sp. nov. Five other new species have been recognized within this fauna of heteromorph ammonites : Lithancylus bifurcatus sp. nov., Proaustraliceras bournaudi sp. nov., Ammonitoceras dumasi sp. nov., A. madouxi sp. nov., A. leiferrasensis sp. nov. and Caspianites ragazziae sp. nov.