Name:
Pentremites sp.
Age: Mississippian
Formation: Ridenhower Formation
Location: Millstadt, Illinois
Size: Blastoid is 1 inch long
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Here is an unusual echinoderm specimen from the Mississippian of Illinois. This is a fine specimen of the blastoid, Pentremites sp. This blastoid has many of the long, fine brachioles preserved, which is a very rare occurrence. The echinoderm has good color and contrast and is nicely showcased on the somewhat square plate of matrix that is just loaded with many bryozoans. This is a very good specimen of a blastoid with the delicate brachioles preserved.
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