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.

Fossil Starfish, Brittle Star & Edrioasteroid Plate #255014

17" Fossil Starfish, Brittle Star & Edrioasteroid Plate

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Four Edrioasteroid (Edriophrus) Fossils - (Special Price)

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Cluster Of Fossil Starfish (Petraster?) - El Kaid Rami, Morocco

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Edrioasteroid (Edriophrus) Fossil - Brechin, Ontario #68338

1.6" Edrioasteroid (Edriophrus) Fossil - Brechin, Ontario

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Starfish (Petraster?) & Edrioasteroid Plate - Ordovician

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Edrioasteroid Cluster () - Covington, Kentucky #68886

Edrioasteroid Cluster (7) - Covington, Kentucky

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Starfish (Petraster?) & Edrioasteroids - Ordovician #41553

2.3" Starfish (Petraster?) & Edrioasteroids - Ordovician

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Two Fossil Starfish (Petraster?) & Edrioasteroids - Morocco

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Fossil Brittle Star (Ophiura) & Edrioasteroids - Morocco

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Plate With Blastoids & Unidentified Edrioasteroid - Illinois #68099

Plate With 10 Blastoids & Unidentified Edrioasteroid - Illinois

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Two Edrioasteroid Fossils - Cedar City Formation, Iowa

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Starfish (Petraster?) & Edrioasteroid (Spinadiscus)- Ordovician #100503

1.7" Starfish (Petraster?) & Edrioasteroid (Spinadiscus)- Ordovician

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Fossil Starfish (Petraster?) & Edrioasteroids - Morocco #178810

1.75" Fossil Starfish (Petraster?) & Edrioasteroids - Morocco

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Interesting Cluster Of Edrioasteroid (Spinadiscus) Fossils - Morocco

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Fossil Ordovician Edrioasteroid Plate - Morocco #115021

8" Fossil Ordovician Edrioasteroid Plate - Morocco

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Ordovician Starfish (Petraster?) & Edrioasteroids - Morocco #94328

2.05" Ordovician Starfish (Petraster?) & Edrioasteroids - Morocco

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Ordovician Starfish Fossil With Edrioasteroids - Morocco #200187

3" Ordovician Starfish Fossil With Edrioasteroids - Morocco

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Fossil Starfish (Petraster?) & Edrioasteroids (Spinadiscus) - Morocco

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Three Edrioasteroids (Isorophus) On Brachiopods - Fairfield, Ohio

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Rare Edrioasteroid (Lepatocystis) Fossil - Brandon, Iowa #68861

.9" Rare Edrioasteroid (Lepatocystis) Fossil - Brandon, Iowa

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Ordovician Fossil Edrioasteroid (Isorophus) Plate - Ohio #270107

6.5" Ordovician Fossil Edrioasteroid (Isorophus) Plate - Ohio

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Fossil Starfish (Petraster?) & Edrioasteroid (Spinadiscus) - Morocco

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Ordovician Edrioasteroid (Spinadiscus) Fossils - Morocco

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Plate of Edrioasteroid Fossils - Shell Rock Formation, Iowa #262604

3.3" Plate of Edrioasteroid Fossils - Shell Rock Formation, Iowa

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Fossil Edrioasteroid (Spinadiscus) Plate - Morocco #115016

6.2" Fossil Edrioasteroid (Spinadiscus) Plate - Morocco

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Two Edrioasteroids (Isorophus) On Brachiopod - Springdale, Ohio

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Edrioasteroid (Unidentified) - Iowa (Special Price) #68864

1.1" Edrioasteroid (Unidentified) - Iowa (Special Price)

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Two Edrioasteroids (Carneyella) On Brachiopod - Indiana

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Pair Of Edrioasteroids (Hemicystites) - Kinkaid Limestone, Illinois

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Fossil Edrioasteroid (Isorophus) With Other Fossils

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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.

EDRIOASTEROID FOSSILS FOR SALE

What Is An Edrioasteroid?

When Did Edrioasteroids Live?

What Did Edrioasteroids Look Like?

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