Parasitic gall on crinoid

Submitted by: David Thompson
Taxon: Myzostomida
Submit date: 2014-07-08
Location (approximate): Alpena, Alpena, MI
Stratigraphy: Potter Farm Formation
Age: Erian (Middle Devonian)
Submitter notes: The Myzostomida are an order of small marine polychaete worms, which are parasitic on crinoids causing gall swelling and holes but rarely leaving any other trace.

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