Isocrinus
Species
Isocrinus knighti Springer, 1909
Occurrence: Sundance
Originally named Pentacrinus asteriscus Meek and Hayden, 1858
Reference: Clark, 1915
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Isocrinus knighti
Drawing from Clark, 1915
Isocrinus wyomingensis Koch, 1962
Occurrence: Redwater
Reference: Koch, 1962; Mentioned in Hunter and Zonneveld, 2008