Placodermi - Phlyctaeniiformes

Parent taxon: Brachythoraci according to R. H. Denison 1984

Sister taxa: Aspinothoracidi, Brachydeiroidea, Buchanosteidae, Buchanosteoidea, Coccosteoidea, Coccosteomorphi, Dinichthyoidea, Doseyosteus, Gemuendenaspidae, Homosteoidea, Homostiidae, Maideria, Pachyosteomorphi, Parabuchanosteidae

Subtaxa: Heterosteidae

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Ecology: nektonic carnivore

Distribution: found only at Stjørdalen (Devonian of Svalbard and Jan Mayen)

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