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meaning: "half round shield"
Named By: unavailable
Time Period: Early Devonian
Location: Canada, Norway, United Kingdom
Size: Roughly about 15 centimetres long
Diet: Uncertain/Detritivore
Fossil(s): Few individuals
Classification: | Chordata | Osteostraci | Atelaspidiformes |

Hemicyclaspis (meaning half-round shield or semicircle plate) 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.

Hemicyclaspis grew to a length of 5 inches (13 centimeters) and would most likely have fed on particles from the muddy sea bed.

Read more about Hemicyclaspis at Wikipedia
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