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Olenellus
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Olenellus
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Olenellus
Olenellus A fossil of the trilobite Olenellus fowleri, Pioche Shale Formation, Lincoln County, Nevada.

Olenellus

trilobite genus
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trilobite

Olenellus, genus of trilobites (extinct arthropods) common in but restricted to Early Cambrian rocks (542 million to 521 million years ago) and thus a useful guide fossil for the Early Cambrian. Olenellus had a well-developed head, large and crescentic eyes, and a poorly developed, small tail.

This article was most recently revised and updated by Richard Pallardy.