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Cycloceras
''Cycloceras'' is an extinct nautiloid cephalopod genus from the Carboniferous of Western Europe, (Ireland and Scotland) of unknown affinity with the orthocerida (Sweet 1964 in) 〔C. Teichert et al 1964. Treatise on Invertebrate Paleontology K(3)Nautiloidea:1-519〕 ==Taxonomy== ''Cycloceras'' was named by McCoy (1844 and assigned to the Michelinoceratida by Flower (1962)and to the Orthocerida by Sweet in Teichert et al. (1964);〔(PaleoBiology Database:''Cycloceras'',basic info )〕 ''Cycloceras'' is possibly a member of the Cycloceratidae and may be synonymous with ''Perigrammoceras'' Foerste
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