Description
Mazon Creek Cyclus obesus
- Cyclus obesus
- Pennsylvanian Age
- Carbondale Formation
- Near Grundy, Illinois
- This nodule includes both halves which measures 1.22″ wide
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Cyclus was a small (~15 mm) aquatic organism that lived in the Mazon Creek 307 million years ago. The Mazon Creek was a tropical estuary with a large area of shallow water habitat. Although originally thought to be a crustacean. But we now believe Cyclus to be more closely related to copepods. However, they were a crustacean subclass. Copepods are of great ecological importance, providing food for many species of fish as well as other marine life.
Diagram by ESCONI
