Heteroceras gracile sp. nov., a new species of Heteroceras Orbigny, 1849, from the upper Barremian of Morteiron (Alpes de Haute-Provence, France)

Abstract

The species Heteroceras gracile sp. nov. is described; it is a small and slender species, with a small helix and hamuliniform morphology, previously considered as an atypical variant of Heteroceras baylei (Reynes, 1876). In southeast France, it is mainly known in the Morteiron section (Alpes de Haute-Provence, France), but the species is also present in Bulgaria and possibly in Japan.