Millerosteus

 ( Coccosteidae ) 

Millerosteus is an extinct genus of coccosteid arthrodire placoderm from the Early Givetian stage of the Middle Devonian period. Fossils are found in Orkney and Caithness, Scotland. It was a small placoderm with a body length of . Millerosteus is one of the few arthrodires known from specimens preserving the entire skeleton.

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Phylogeny Millerosteus is a member of the family Coccosteidae, which belongs to the clade Coccosteomorphi, one of the two major clades within Eubrachythoraci. The cladogram below shows the phylogeny of Millerosteus:

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