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Name:
Pleurocystites squamosus
Age: Ordovician
Formation: Bobcaygeon Formation
Location: Ontario, Canada
Size: Cystoid is over 3 inches long
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Here is a great example of a primitive echinoderm. This is a cystoid (Pleurocystites) from the Ordovician layers of Ontario, Canada. The theca of this extinct echinoderm is beautifully articulated and the detail is excellent. The plate structure is superb, and the pore-rhombs are easily seen. Both of the uniserial arms are intact, which is highly unusual. The LONG, curled stem is still tightly attached. The cream-colored fossil contrasts nicely with the grey matrix. The cystoid is beautifully showcased on the semi-rectangular plate of limestone. This is a fabulous example of this unusual Ordovician echinoderm.
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