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Name:
Archaeocidaris illinoisensis
Age: Mississippian
Formation: St. Louis Formation
Location: St. Louis, Missouri
Size: Urchin is almost 2 inches across w/spines
This specimen is not for sale
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This is a very rare and important find. It is a fabulous Archaeocidaris illinoisensis from the Mississippian of St. Louis. Fossil echinoids from the St. Louis area are famous around the world and have been extremely sought-after by collectors for decades. This urchin was found YEARS ago, stored in a box, and just now opened and prepared - when they're all gone, they're GONE! This spiny urchin is larger than the Lepidocidaris found in the Mississippian Warsaw Formation, and are OLDER than the Pennsylvanian Archaeocidaris from Texas. This urchin is complete with MANY barbed spines still intact. Most of the types of urchins from this site have smooth spines (there are three species!), and ones with the barbed spines are rare. The echinoid displays well on the large, natural plate of matrix that also has two urchins on the back side. This is a very rare example of a spiny Mississippian echinoid from the St. Louis Formation, offered exclusively through EXTINCTIONS.
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