Hemicyclaspis
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| Hemicyclaspis Fossil range: Early Devonian |
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Hemicyclaspis is an extinct genus of primitive jawless fish, closely related to Cephalaspis, that lived in the Devonian period in what is now Europe and North America.
A typical cephalaspid, Hemicyclaspis had a heavily armored, shovel-shaped headshield. It is thought to have been a better swimmer than most of its relatives because of its powerful tail, stabilizing dorsal fin and the keel-shaped hydrodynamic edges of its head shield. Hemicyclaspis probably foraged the ocean floor for food.
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