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Ceraurus

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description Ceraurus Overview

Ceraurus is an extinct genus of cheirurid trilobites that thrived in shallow marine environments during the Ordovician period. These arthropods are commonly found in Paleozoic limestone deposits across North America and parts of Europe. The genus is distinguished by its heavily armored exoskeleton, which features prominent, swept-back genal spines on the head shield and a small tail shield adorned with multiple pointed pygidial spines. Paleontologists easily identify Ceraurus fossils by this distinct, spiny tail morphology.

help Ceraurus FAQ

What kind of trilobite was Ceraurus?

Ceraurus was a cheirurid trilobite that lived in Ordovician shallow seas. Its fossils are especially associated with Paleozoic limestone deposits in North America and parts of Europe.

What features identify Ceraurus pleurexanthemus?

Ceraurus pleurexanthemus has long divergent genal spines and two long marginal spines on the pygidium. It is a common Middle Ordovician trilobite in Trenton-age rocks of central New York. [Harvard University Trenton Group collection](https://trenton.mcz.harvard.edu/phylum-arthropoda-0)

Could Ceraurus swim, or did it live on the sea floor?

It was a marine trilobite associated with shallow-water environments and most likely spent much of its time walking across the sea floor. The spines may also have helped stabilize the animal or discourage predators in soft sediment.

How does Ceraurus differ from other Ordovician trilobites?

Its long paired cheek spines and unusually prominent pygidial spines make it easier to recognize than smoother forms such as Flexicalymene. A reliable identification still requires the head, thorax, and tail together because broken limestone specimens can be misleading.

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