Abstract
Systematic revisions and revised stratigraphic occurrences are made toAorocrinus, Dorycrinus, Macrocrinus, Paradichocrinus, Strotocrinus, andUperocrinusfrom the Osagean and Meramecian stratotype region in Iowa and Missouri. Systematic revisions include the assignment ofBatocrinus procerusMiller and Gurley as a junior synonym ofMacrocrinus mundulus. Batocrinus heteroclitusMiller and Gurley,B. vicinusMiller and Gurley, andB. stelliformisMiller and Gurley are assigned toUperocrinus heteroclitusn. comb. The concept ofAorocrinus spinosulus(Hall) did not match characteristics of the holotype. Consequently, the appropriate name for this concept isAorocrinus kelloggi(Worthen) n. comb., andA. spinosulusis assigned toDorycrinus mississippiensisas a junior synonym.Batocrinus strenuusis assigned toAorocrinus strenuusn. comb.?; andStrotocrinus glyptusis regarded as the valid name for the only species recognized in this genus.These systematic revisions result in the restriction ofStrotocrinus glyptusto the middle Osagean Burlington Limestone, and extension ofAorocrinus, Dorycrinus, Macrocrinus, andUperocrinusinto the Meramecian upper Warsaw Formation.
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