Cephalochordata - Craniata

Synonym: Monorhina

Full reference: J. A. Moy-Thomas and R. S. Mile. 1971. Palaeozoic Fishes

Parent taxon: Osteostracomorphii according to J. A. Long 2011

Sister taxa: none

Subtaxa: Atelaspidiformes, Ateleaspis, Birkeniiformes, Cephalaspidida, Cephalaspidiformes, Galeaspidiformes, Pituriaspidiformes

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Ecology: fast-moving nektonic carnivore