Boreaspis ("Boreas' Shield") is an extinct genus of primitive jawless fish that lived in the Devonian period.
At least 14 species of Boreaspis are known from sandstones laid down in the lagoons of Spitsbergen during the early Devonian.
They differ in the width of their triangular shaped head shields, and in the length of the bony spine theat grew out from the cheek area on either side.
The snout was elongated in all species into a bladelike rostrum. Beside its hydrodynamic function, the rostrum was probably used to probe for pray on the muddy lagoon floor.
Source from great site: http://www.rareresource.com
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