EucalycocerasEucalycoceras is an extinct genus of cephalopods belonging to the Ammonite subclass.SpeciesE. collignoni Fabre, 1940 E. denizoti Fabre, 1940E. gothicum Kossmat, 1895E. pentagonus Jukes-Browne, 1896DescriptionEucalycoceras are medium-sized ammonites, generally compressed, with flattened flanks and venter with dense tuberculate ribs.DistributionFossils of this genus have been found in the Cretaceous of Antarctica, Brazil, France, the United Kingdom and United States.