| Millerosteus ↓ | |
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| Fossil of Millerosteus minor in the Field Museum of Natural History. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Suborder: | †Brachythoraci |
| Family: | †Coccosteidae |
| Genus: | †Millerosteus Stensiö, 1959 |
| Species | |
Millerosteus is an extinct genusofcoccosteid 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 an body length of 14 cm (5.5 in).[1] Millerosteus is one of the few arthrodires known from specimens preserving the entire skeleton.
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 phylogenyofMillerosteus:[2]
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| Millerosteus |
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| Millerosteus minor |
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