Four Species Assemblage of Crawfordsville Crinoids

Name: 4 species-Histocrinus coreyi, Platycrinites hemisphericus, Scytalocrinus robustus, plus coral Cladochonus beecheri

Age: Lower Mississippian Osagean Stage (345 m.y.a)

Sizes (25.4 mm = 1 inch): Size: mm (25.4mm=1 inch): Histocrinus crown: 100 mm long by 25 mm wide, stem: 203 mm; Playcrinites crown: 60 mm long by 33 mm wide, stem: 90 mm; Scytalocrinus crown: 30 mm long by 21 mm wide, stem: 40 mm; coral 32 mm by 23 mm on a 340 mm by 200 mm matrix

Location: Crawfordsville, Indiana

A museum quality example of an Inadunate Cladid crinoid (Family Scytalocrinidae) known as Histocrinus coreyi from the famous Crawfordsville crinoid beds showing over 200 mm of attached stem complete with attached cirri. Cirri found near the holdfast base were used as additional anchors in the sea floor. This spectacular crinoid is found in association with a fine Platycrinites hemisphericus (Camerate crinoid, Family Platycrinitidae) showing the characteristic spiral stem of the genus. The smallest crinoid is a Scytalocrinus robustus (Cladid, Family Scytalocrinidae). Preservation on this specimen is remarkably complete, down to the fine pinnules on the arms. They are found in association with a fragment of the coral Cladochonus beecheri. Crinoids like this could be found in association because their differing stem lengths allowed them each to feed in their own level of the water column.

click crinoid pictures to enlarge

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