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Groenlandaspis
Groenlandaspis
Paleozoo

Groenlandaspis

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Groenlandaspis sp. is an extinct placoderm of Late Devonian period (360 ma).  It is a member of the order Arthrodira (gk. jointed neck) and it had a distinctive thoracic shield with a pyramid-like peak that would have helped it plane through the water column.