Isopod from the Pennsylvanian of Illinois

@article{Schram1970IsopodFT,
  title={Isopod from the Pennsylvanian of Illinois},
  author={Frederick R. Schram},
  journal={Science},
  year={1970},
  volume={169},
  pages={854 - 855}
}
  • F. Schram
  • Published 1970
  • Biology, Medicine
  • Science
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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The purpose of this note is to describe a newly discovered Middle Pennsylvanian fauna from the Francis Creek shale of the Mazon Creek area, Illinois. For convenience, the well-known terrestrial faunaExpand
For example, see Orbiter photographs of Messier A in
  • Nat. Aeronaut. Space Admin. Spec. Publ
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