Devonian Scotland

assemblage of Devonian rocks in Great Britain, Ireland, Norway and northeastern North America, consisting of sedimentary rocks including reddish sandstone

Coccosteus (from , 'berry' and 'bone') is an extinct genus of arthrodire placoderm from the Devonian period. Its fossils have been found throughout Europe and North America. The majority of these have been found in freshwater sediments, though such a large range suggests that they may have been able to enter saltwater. It was a small placoderm, with Coccosteus cuspidatus measuring long.

Mesacanthus ('middle spine') is an extinct genus of acanthodian fish from Devonian Scotland. It is among the more primitive of the Devonian acanthodians.