Eucalycoceras is an extinct genus of cephalopods belonging to the Ammonite subclass. Species E. collignoni Fabre, 1940 E. denizoti Fabre, 1940 E. gothicum Kossmat, 1895 E. pentagonus Jukes-Browne, 1896 Description Eucalycoceras are medium-sized ammonites, generally compressed, with flattened flanks and venter with dense tuberculate ribs. Distribution Fossils of this genus have been found in the Cretaceous of Antarctica, Brazil, France, the United Kingdom and United States. See also List of ammonite genera References Tarrantoceras Stephenson and Related Ammonoid Geneva from Cenomanian (Upper Cretaceous) Rocks in Texas and the Western Interior of the United States The Paleobiology Database J. Sepkoski Online Cretaceous ammonites Acanthoceratidae Ammonitida genera Fossils of Brazil Fossils of the United States Fossils of France