Lyropora sp. #1
Bryozoan

Mississippian
Paint Creek Group
Ridenhower Formation
Vogel School site, near Floraville, Illinois

 




This feature appeas to be a reaction to a parasite/predator attack

In life, fenestrate filled the opening between the "V" structure.
Similar to the fenestrate attached to the screw-like axis
of the bryozoan Archimedes.

Reference

The bryozoan genera Lyropora and Lyroporidra
(order Fenestrida, family Polyporidae) in Upper Mississippian
(Chesterian) rocks of eastern North America.
American Museum novitates ; no. 3111
McKinney, Frank K. (Frank Kenneth)
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