Acanthoceras gevreyi Jacob, 1907 originates from a condensed Albian horizon at La Perte du Rhône, Bellegarde (Ain, France). This species is still very poorly known and its taxonomic interpretation in the literature is most often erroneous. New and abundant material from
SE France, North Africa and South America allows the revision of this taxon and shows that Lyelliceras flandrini Dubourdieu, 1953, is one of its minor subjective synonyms. As a consequence the systematic position, stratigraphic range and palaeobiogeographic distribution of Acanthoceras
gevreyi Jacob are discussed. Prolyelliceratidae fam. nov. is proposed.
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