Amecystis Cystoid Fossil from Canada

Name: Echinodermata; Pleuricystidae; Amecystis sp.

Geologic Time: Middle Ordovician (~440 million years ago)

Size (25.4mm=1 inch): Theca: 40 mm Stem: 20 mm Matrix: 80 mm x 90 mm

Fossil Site: Bobcaygeon Formation, Simcoe, Ontario, Canada

Code: Amecystis

Price: $75.00 - sold

Description: This is a rhombiferan cystoid known as Amecystis. They are thought to have been mobile, but lying upon the surface of the seafloor, a belief verified when one was found to have an attached edrioasteroid. The theca has partial arms, an uncommon occurrence. There is also a partial Isotomocrinus cf. typus crinoid on the plate, making for an interesting association of 2 Echinodermas of disparate morphology.

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