--+--Ornithschia +--Genasauria |--Lesothosaurus +--+--Ornithopoda +--+--"Hypsilophodontia" +--+--Dryosauridae +--+--Camptosauridae +--+--Hadrosauridae +--Iguanodontidae
The advanced "hypsilophodontian" Parksosaurus warrenae ("Warren's
Parks' lizard"), advanced without premaxillary teeth, and somewhat
similar to dryosaurids.
The basal dryomorph ornithopod Muttaburrasaurus langdoni
("Langdon's Muttaburra [Station] lizard"), close to both
Dryosaurus and Camptosaurus.
NOTE: the skull of Muttaburrasaurus above is based on M. langdoni; a second skull has been discovered and described with a more complete snout region that suggests a different morphology, but similar refered to the same genus (M. sp.); this page will reflect a more concise comparison and reconstruction of both skulls, which I believe differ in the snout to some degree.
The advanced iguanodontid iguanodontian Altirhinus kurzanovi
("Kurzanov's tall nose"), closely related to Iguanodon.
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