Detailed Mississippian Pentremites Blastoid Fossil

Pentremites sp

Phylum Echinodermata, Class Blastoidea, Order Spiraculata

Geological Time: Mississippian

Size: Blastoid fossil is 80 mm long overall Theca: 10 mm by 15 mm Matrix: 125 mm by 130 mm

Fossil Site: Big Clifty Formation, Sulphur, Indiana, USA

Fossil Code: AW89

Price: Sold

Pentremites Blastoid FossilDescription: This plate displays a near complete example of a blastoid known as Pentremites. Blastoids are relatives of the crinoids that have a theca (body) that looks like a hickory nut. They arose during the Ordovician and became extinct during the Permian. Like all other echinoderms they typically would disarticulate shortly after death. Typically most are only seen as the theca. This one must have been buried soon after death to be preserved in such a near complete state. Note the fine brachioles that would have been used for filter feeding and the stem which would have placed the animal in the water column rather than on the seafloor.

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