Hemicyclaspis

phylum	Chordata	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. Hemicyclaspis grew to a length of 5 inches (13 centimeters) and would most likely have fed on particles from the muddy sea bed. For more information, visit the Wikipedia entry. Get back to Agnatha
class	†Osteostraci
order	Atelaspidiformes
genus	Hemicyclaspis
Period	Early Devonian

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  Kaiyodo Dinotales 3 Hemicyclaspis