CLASSIFICATION
| PARENT CLADES: Animalia: Vertebrata: Tetrapoda: Sauropsida: Archosauromorpha: Ornithodira: Dinosauria: Theropoda: Tetanurae: Coelurosauria: Avialae —Ornithurae “bird tails” == {Neornithes + Hesperornis} |–+–Apsaravis | `–Carinatae == {Neornithes + Ichthyornis} | | INCERTAE SEDIS: | | unnamed form (nearly complete skeleton) — Campanian to Maastrichtian — Mongolia | |–Ichthyornithiformes “Ichthyornis forms” ?=Apatornithiformes | | | INCERTAE SEDIS: | | | unnamed form — N. America | | |?-Apatornis | | `–Ichthyornis | `–+–Limenavis | `–+?-Lithornithiformes * | `—->Neornithes `—->Hesperornithiformes | ALTERNATE CLADOGRAM: —Genasauria |–Thyreophora | |–Scutellosaurus | `–Thyreophoroidea | |–Scelidosaurus | `–Ankylosauria `–+–Stegosauria (definition altered) | |–Emausaurus | `–+–Huayangosauridae | `–Stegosauridae `–Cerapoda |–Ornithopoda `–+–Heterodontosauridae `–Marginocephalia [ Top | Classification | Essay ] ALTERNATE CLADOGRAM: —Genasauria (definition altered) |–Ornithopoda `–Orbitoscuta == {Triceratops + Ankylosaurus} |–Thyreophora `–Marginocephalia [ Top | Classification | Essay ] ALTERNATE CLADOGRAM: —Ornithischia |–Pisanosaurus `–+–Genasauria `–Fabrosauridae Galton, 1972 sensu Peng, 1997 =Lesothosauridae |–Fabrosaurus `–+–Agilisaurus `–Gongbusaurus [ Top | Classification | Essay ] ALTERNATE CLADOGRAM: —Cerapoda |–Marginocephalia `–Ornithopoda |–Heterodontosauridae `–Euornithopoda |
see also: Genus Index, Classification
MEASUREMENTS
| Ornithurans include modern birds (neornitheans) and their relatives. Except for neornitheans, ornithurans retained small teeth in their jaws, except at the front of the upper jaw (premaxilla). |
