Hemicyclaspis
Ichthyostega- The first amphibians, such as Ichthyostega, appeared towards the end of the Devonian period.
- Both freshwater and marine fishes show a great proliferation of forms, with many heavily armoured fishes including the Pteraspids, and the Cephalaspids such as Hemicyclaspis.
- The evolutionary trends of the Silurian period continued during the Devonian period, with plants and vertebrate animals showing spectacular advances.
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