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Donacoceras
''Donacoceras'' is an extinct genus of actively mobile carnivorous cephalopod, essentially a ''Nautiloid'' that lived in what would be North America during the Ordovician from 460.5—443.7 mya, existing for approximately .〔(PaleoBiology Database: ''Donacoceras'', basic info )〕 ==Taxonomy== ''Donacoceras'' was named by Foerste (1925). It was assigned to ''Orthocerida'' by Teichert et al. (1964); and to ''Endocerida'' by Sepkoski (2002).〔C. Teichert, B. Kummel, W.C. Sweet, H.B. Stenzel, W.M. Furnish, B.F. Glenister, H.K. Erben, R.C. Moore, and D.E. Nodine Zeller. 1964. Cephalopoda - general features - Endoceratoidea - Actinoceratoidea - Nautiloidea - Bactritoidea. Treatise on Invertebrate Paleontology K(3):1-519〕〔J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560〕
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