Alternative spelling: Placodermata
Parent taxon: Placodermiomorphi according to J. S. Nelson et al. 2016
See also Bryant 1932, Denison 1975, Dineley and Metcalf 1999, Hay 1902, Jaekel 1911, Kiessling 2004, Long 2011, Säve-Söderbergh 1934 and Sepkoski 2002
Sister taxa: none
Subtaxa: Acanthothoraci Acanthothoraciformes Antiarcha Arthrodira Asiacanthus Austroptyctodus Bianchengichthys Brindabellaspida Campbellodus Changyonophyton Coccostei Coelosteichthys Deinodus Entelognathus Hybosteus Neopetalichthys Nessariostoma Oestophorus Petalichthida Petalichthyida Petalichthyida Pseudopetalichthyida Pseudopetalichthyiformes Ptychostei Ptyctodontida Rhenanida Rhenaniformes Sedowichthys Stensioellida Tollichthys Wangolepis Yunnanacanthus
Ecology: nektonic carnivore