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Calycoceras
''Calycoceras'' is an extinct cephalopod genus belonging to the subclass Ammonoidea and family Acanthoceratidae that lived during the Cenomanian stage of the Late Cretaceous, 100-94 Mya. 〔 Sepkoski, Jack (Sepkoski's Online Genus Database – Cephalopodes ) 〕 Their shells had ornate ribs. 〔(Ammonites ) 〕 ==Species==
*''Calycoceras annulatum'' Collignon 1964 *''Calycoceras asiaticum'' (Jimbo, 1894)〔 William James Kennedy, Herbert Christian Klinger (2010) (Cretaceous faunas from Zululand and Natal, South Africa. The ammonite subfamily Acanthoceratinae de Grossouvre, 1894 ) 〕 *''Calycoceras besairieri'' Collignon 1937 *''Calycoceras boreale'' Kennedy, Cobban & Landman 1996 〔(Global Names Index ) 〕 *''Calycoceras dromense'' (Thomel, 1972) 〔(AMNH ) 〕 *''Calycoceras cenomanense'' (d’Archiac) *''Calycoceras navicularis'' Mantell 1822 *''Calycoceras orientale'' Matsumoto, Saito & Fukada 〔(UMUT ) 〕 *''Calycoceras paucinodatum'' (Crick) 〔(Smithsonian Institutions ) 〕 〔 (The Paleobiology Database )〕
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