Isopod from the Pennsylvanian of Illinois

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Science  28 Aug 1970:
Vol. 169, Issue 3948, pp. 854-855
DOI: 10.1126/science.169.3948.854


Hesslerella shermani is described as the oldest representative of the crustacean superorder Peracarida, order Isopoda, suborder Phreatoicidea. This description is based on a single specimen of exceptional preservation from the Middle Pennsylvanian of Illinois. The existence of isopods in the Pennsylvanian raises some questions concerning peracarid and eumalocostracan evolution.

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