Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A genus of fossil ganoid fishes found in the old red sandstoneor Devonian formation. The head is large, and protected by a broadshield-shaped helmet prolonged behind into two lateral points.
