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Nice Spiny Archaeocidaris Urchin from St. Louis
ECHINOIDS • UNITED STATES
Stock Number XIECA705
EXTINCTIONS Choice

Name:   Archaeocidaris illinoisensis
Age:  Mississippian
Formation:  St. Louis Formation
Location:  St. Louis, Missouri
Size:  Plate is over 2 inches across
This specimen is not for sale
Click here for similar specimens that are for sale

This is a nice US echinoderm fossil. It is a spiny 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. These spiny urchins are larger than the Lepidocidaris found in the Mississippian Warsaw Formation, and are OLDER than the Pennsylvanian Archaeocidaris from Texas. This urchin has 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 quite cool. The echinoid displays well on the natural plate of matrix. This is a fine example of Archaeocidaris illinoisensis from the St. Louis Formation.