Placodermi - Phlyctaeniiformes
Parent taxon: Brachythoraci according to R. H. Denison 1984
See also Denison 1978 and Plax and Newman 2020
Sister taxa: Aspinothoracidi, Brachydeiroidea, Buchanosteidae, Buchanosteoidea, Coccosteomorphi, Dinichthyoidea, Doseyosteus, Gemuendenaspidae, Heterosteoidea, Homosteoidea, Homostiidae, Maideria, Pachyosteomorphi, Parabuchanosteidae
Subtaxa: Coccosteidae
Type: Coccosteidae
Ecology: nektonic carnivore
Distribution:
• Carboniferous of the United Kingdom (1 collection)
• Givetian of the United Kingdom (1)
• Devonian of Belarus (3), Estonia (5), Germany (1), Iran (1), Ireland (1), Latvia (4), South Africa (1), Svalbard and Jan Mayen (1), the United Kingdom (40), United States (2: Arizona, Pennsylvania)
Total: 61 collections including 62 occurrences