Agnostida

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Suborder Agnostina

Suborder Eodiscina

Agnostida is an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian. They are present in the lower Cambrian fossil record along with trilobites from the Redlichiida, Corynexochida, and Ptychopariida orders. The last agnostids went extinct in the Late Ordovician.

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Systematics

The Agnostida are divided into two suborders — Agnostina and Eodiscina — that are then divided into a number of families. As a group, agnostids are isopygous, meaning that their pygidium is similar in size and shape to their cephalon. Most agnostid species were eyeless.

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