Placodermi - Phlyctaeniiformes
Parent taxon: Brachythoraci according to R. H. Denison 1984
See also Denison 1978 and Plax and Newman 2020
Sister taxa: Aspinothoracidi, Beyrichosteus, Brachydeiroidea, Buchanosteidae, Buchanosteoidea, Coccosteomorphi, Dinichthyoidea, Doseyosteus, Gemuendenaspidae, Heterosteoidea, Homosteoidea, Homostiidae, Maideria, Pachyosteomorphi, Parabuchanosteidae
Subtaxa: Coccosteidae Kimberia
Type: Coccosteidae
Ecology: nektonic carnivore
Distribution:
• Carboniferous of the United Kingdom (1 collection)
• Givetian of the United Kingdom (1)
• Devonian of Australia (2), Belarus (3), China (1), 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: 64 collections including 67 occurrences