Olenellus

Olenellus is an extinct genus of trilobites, fossil marine arthropods, with species of average size (about 5 centimetres or 2.0 inches long). It lived during the Botomian and Toyonian stages (Olenellus-zone), 522 to 510 million years ago, on the paleocontinent Laurentia, currently North-America and Western Schotland.