†suborder Brachythoraci Gross 1932 (armour-plated fish)
Placodermi - Phlyctaeniiformes
Parent taxon: Phlyctaeniiformes according to R. van der Laan 2019
See also Denison 1984, Long 2011, Straka and Semken 1969 and Young 2010
Sister taxa: Arctaspididae, Arctolepididae, Gronlandaspididae, Holonematidae, Phlyctaeniidae, Phlyctaenioidei
Subtaxa: Aspinothoracidi Beyrichosteus Brachydeiroidea Buchanosteidae Buchanosteoidea Coccosteoidea Coccosteomorphi Dinichthyoidea Doseyosteus Gemuendenaspidae Heterosteoidea Homosteoidea Homostiidae Maideria Pachyosteomorphi Parabuchanosteidae
Ecology: nektonic carnivore