The Cubozoan Anthracomedusa turnbulli

This is a really cool fossil. Think of how rare it must be for an animal without a hard shell or skeleton to be preserved as a fossil. Unfortunately, this is the only specimen of Anthracomedusa that we have in our collections at UCMP. Other specimens from Mazon Creek better reveal the square shape of the bell, as well as the four bunches of tentacles.

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Foster, Merrill W. 1979. Soft-bodied coelenterates in the Pennsylvanian of Illinois. pp. 191-267 In: Mazon Creek fossils. edited by Nitecki, Matthew H. Academic Press, New York, NY.