Fossil Crinoids (Uperocrinus & Physetocrinus) - Missouri

 
This is a cool plate of Mississipian aged echinoderm fossils from Missouri. There is a pair of crinoid calynxes (Uperocrinus pyriformis & Physetocrinus ventricosus) on a matrix full of crinoid fragments. They have been prepared with air abrasives and come with an acrylic display stand.

Crinoids, sometimes commonly referred to as sea lilies are animals not plants. They are echinoderms related to starfish, sea urchins and brittle stars. Many crinoid traits are like other members of their phylum. Such traits include tube feet, radial symmetry, a water vascular system, and appendages in multiples of five (pentameral). They first appeared in the Ordovician (488 million years ago) and some species are still alive today.

Blastoids are an extinct type of filter feeding, stemmed echinoderm that resembles a small hickory nut. They thrived during the Mississippian period before going extinct during the great Permian extinction. While not as diverse as their relative the crinoid, they were equally as common in rocks around the world. Blastoids were protected by a set of interlocking plates, which formed the main body, or theca. In life, the theca of a typical blastoid was attached to a stalk or column made up of stacked disc-shaped plates.
DETAILS
SPECIES
Uperocrinus pyriformis & Physetocrinus ventricosus
LOCATION
Marion County, Missouri
FORMATION
Burlington Formation
SIZE
Rock 3.9x2.2"
CATEGORY
SUB CATEGORY
ITEM
#80803
GUARANTEE
We guarantee the authenticity of all of our
specimens. Read more about our
Authenticity Guarantee.