The functional morphology and stratigraphic distribution of the Mississippian blastoid Orophocrinus

Differences in the position of the brachioles on the ambulacra, and the number of hydrospires, indicate that species of this widespread genus inhabited two separate environments: carbonate shelf, and biohermal. Ten valid species are recognized, including two new: O. celticus and O. saltensis. Species erroneously assigned to Orophocrinus by earlier authors are removed, and junior synonyms of valid species are listed. A key to species is offered, diagnostic characters are tabulated, and phylogeny, ontogeny, and functional morphology are discussed in detail.

This record provided courtesy of AGI/GeoRef.

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				R. P. S. Jefferies, K. A. Joysey, C. R. C. Paul, and W. H. C. Ramsbottom Chapter 21 Echinodermata: Pelmatozoa Geological Society, London, Special Publications, January 1, 1967; 2(1): 565 - 581. [Abstract] [PDF]