†family Leiosteidae Stensiƶ 1963 (armour-plated fish)
Placodermi - Phlyctaeniiformes - Leiosteidae
Parent taxon: Aspinothoracidi according to R. van der Laan 2019
See also Denison 1975, Denison 1978 and Denison 1984
Sister taxa: Brachydeiridae, Braunosteidae, Bulbocanthidae, Dinichthyidae, Gorgonichthys, Hadrosteidae, Heintzichthys, Leptosteidae, Titanichthyidae
Subtaxa: Erromenosteus Leiosteus
Type: Leiosteus
Ecology: nektonic carnivore
Distribution: found only at Bad Wildungen site (Devonian of Germany)