PaleoDB taxon number: 368239
Alternative spelling: Placodermata
Parent taxon: Pisces according to R. H. Denison 1975
Sister taxa: Actinopterygii, Actinopterygii, Andreolepis, Cephaloxeniformes, Coregonidae, Crenilepis, Cyclotomodon, Dipteriformes, Ganoidei, Iniomi, Lophosteus, Nothosoma, Pattonia, Pattonia couttsi, Preophiodon, Sarcopterygii, Tythonichthys, Acanthodii, Charitosaurus, Malacostomata, Rhytiodus, Merlangius, Azygostei, Argentinoideorum, Aspidoganoidei, Ptilichnus, Otolithopsis, Chrondroterygia, Dipneusta, Percidarum, Hypostomata, Teleostomi, Lepidoleprus, Teleostomata
Subtaxa: Acanthothoraci, Antiarcha, Arthrodira, Asiacanthus, Austroptyctodus, Brindabellaspida, Campbellodus, Changyonophyton, Coccostei, Coelosteichthys, Deinodus, Hybosteus, Neopetalichthys, Nessariostoma, Oestophorus, Petalichthida, Petalichthyida, Petalichthyida, Phyllolepida, Pseudopetalichthyida, Ptychostei, Ptyctodontida, Rhenanida, Sedowichthys, Stensioellida, Tollichthys, Yunnanacanthus
Ecology: nektonic carnivore