Edrioasteroid Fossils For Sale

Edrioasteroids are extinct echinoderms that lived permanently attached to a surface or the seafloor. Distantly related to starfish and sea urchins, they have a body laid out in a pentameral pattern. They look like tiny cushions with five rays radiating out from the center mouth.

6 Items ($19 to $45)

Fossil Edrioasteroid (Isorophus) With Other Fossils

$45

3 days ago

Three Edrioasteroid (Isorophusella) Fossils - Ontario

$29

3 days ago

Fossil Edrioasteroid (Isorophus) on Brachiopod - Utah #277614

.7" Fossil Edrioasteroid (Isorophus) on Brachiopod - Utah

$35

3 months ago

Fossil Edrioasteroid (Isorophus) on Brachiopod - Ohio #277610

.5" Fossil Edrioasteroid (Isorophus) on Brachiopod - Ohio

$25

3 months ago

Fossil Edrioasteroid (Isorophus) on Brachiopod - Ohio #277603

.55" Fossil Edrioasteroid (Isorophus) on Brachiopod - Ohio

$25

3 months ago

Edrioasteroid (Isorophus) On Brachiopod - Fairfield, Ohio #94651

.6" Edrioasteroid (Isorophus) On Brachiopod - Fairfield, Ohio

$19

3 months ago

What Is An Edrioasteroid?

Edrioasteroids are an extinct class of echinoderms distantly related to starfish and sea urchins. They have bodies laid out in pentameral patterns, water vascular systems, and skeletons made of calcite plates. They were filter feeders who lived permanently attached to an object or the seafloor. Some may have had short stems like crinoids, but most lived flat on whatever object they had attached to as larva.

When Did Edrioasteroids Live?

Edrioasteroids appear in the Cambrian Period about 515 million years ago. Their diversity peaked during the Late Ordovician Period. They went extinct by the end of the Permian Period about 275 million years ago.

What Did Edrioasteroids Look Like?

Edrioasteroids were small organisms ranging from a few millimeters to a couple centimeters wide. They looked like tiny cushions attached to a substrate. The mouth was in the center of the theca (body) and from it, five ridges radiated out in a pentaradial pattern. These ambulacra channeled food along the body to the mouth. There is little fossil evidence of how this was done, but by looking at modern echinoderms, it is likely Edrioasteroids had cilia or tube feet along the ambulacra that moved the food to the mouth. The ambulacra radiateed out from the mouth in either straight lines or curving to form a whorl. Usually they all curve in the same direction, but in a few species they curve in different directions.

Featured Photos

Edrioasteroid (Edriophrus) Fossil - Brechin, Ontario #68338

EDRIOASTEROID FOSSILS FOR SALE

What Is An Edrioasteroid?

When Did Edrioasteroids Live?

What Did Edrioasteroids Look Like?

Featured Photos