Agnostus

genus of trilobites (an extinct group of aquatic arthropods) found as fossils in rocks of Early Cambrian to Late Ordovician age (those deposited ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/a/29

Agnostus

Agnostus is a genus of agnostid trilobites that lived during the upper Middle Cambrian–lower Upper Cambrian (approximately 506 to 492 million years ago). It is the type genus of the family Agnostidae. It is subdivided into two subgenera, Agnostus and Homagnostus. == Etymology == Agnostus is from the Ancient Greek άγνωστος (ágnostos) `u.
Found on http://en.wikipedia.org/wiki/Agnostus
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