IMMENSE Gravicalymene Trilobite from New York

with Preserved Microconchid Epibiont

Gravicalymene sp Trilobite

Trilobites Order Phacopida, Family Calymenidae

Michroconchida indet

Phylum Uncertain, Class Tentaculida

Geological Time: Middle Ordovician

Size (25.4 mm = 1 inch): Trilobite is 50 mm long by 33 mm wide Microconchid: 1.5 mm across on a 105 mm by 85 mm matrix

Fossil Site: Lower Utica Shale, Herkimer County, New York

Fossil Code: MMT148

Price: Sold

Gravicalymene Trilobite with Preserved Microconchid EpibiontDescription: I have recently acquired a selection of Odovician and Devonian trilobites from New York State, all of which are distinctive in terms of preservation, unique preservational features, or unusual heritage. This plate displays a huge Gravicalymene sp. trilobite, the largest I have ever seen. What is even more unusual is the presence of an epibiont known as a Microconchid. The Microconchids are a group of small spirally-coliled encrusting worm tubes known from the Upper Ordovician to the Middle Jurassic. Some were previously known as the polychaete worm Sprirorbis. Epibionts are organisms that live on the surface of another. While some can be harmless, others can be parasitic. See my other offerings for another unique example. In addition, this one comes from the Utica Shale, a stratum not well known for the presence of calymenids.

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