Phylum Chordata Bateson, 1885 - chordates
Subphylum Vertebrata Cuvier, 1812 - vertebrates
Class Reptilia Linnaeus, 1758 - reptiles
Subclass Diapsida Osborn, 1903 - diapsids
see Clade Diapsida Osborn 1903 [Laurin 1991]
Infraclass Archosauromorpha Huene, 1946
see Clade Archosauromorpha Huene 1946 [Gauthier, Kluge & Rowe 1988] {Laurin 1991}
Superorder Archosauria Cope, 1869 - archosaurs
see Clade Archosauria Cope 1869 [Gauthier & Padian 1985]
Order †Ornithischia Seeley, 1887
Suborder †Ornithopoda Marsh, 1871
see Infraorder Ornithopoda
Family †Heterodontosauridae
Genus †Abrictosaurus Hopson, 1975