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Essexella asherae Jellyfish fossils.JPG

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Essexella asherae Jellyfish fossils

Francis Creek Shale, Mazon Creek, Illinois
Pennsylvanian Period (323.2-298.9 million years ago )
Essexella is an extinct genus of scyphozoan jellyfish known from Late Carboniferous fossils containing the species Essexella asherae. See list of prehistoric medusozoans. It is one of the most recurrent organisms in the Mazon Creek fossil beds of Illinois. In the Essex biota of Mazon Creek, it consists of 42% of all fossil finds. Its behavior is speculated to be similar to that of modern-day jellyfish.
Kingdom: Animalia
Phylum: Cnidaria
Class: Scyphozoa
Order: Rhizostomeae
Family: Rhizostomatidae
Genus: †Essexella
Species: †asherae



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Photo Information for Essexella asherae Jellyfish fossils.JPG

Taken with Canon Canon PowerShot SX120 IS

  • 7.3 mm
  • 1/60
  • f f/3.2
  • ISO 80
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