Catalog / origin Competing early-dinosaur morphology matrices A 74-taxon, 457-character matrix recovered Ornithoscelida, while rescoring and added taxa recovered the traditional ornithischian–saurischian split.
Dinosaurs Automated data audit passed Maintainer review not performed External expert review not performed
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Represented range 233–228 Ma
Regions 74-taxon, 457-character morphology matrix
Clades Dinosauria · Ornithischia · Saurischia · Theropoda
Claim ledger topology · contested The cited 457-character analysis recovers Theropoda plus Ornithischia as Ornithoscelida, whereas the published rescoring and taxon-addition test recovers the traditional topology; these are competing matrix results, not directly observed ancestry or a settled definition of Dinosauria.
claim:event:dinosaur-radiationReferences A new hypothesis of dinosaur relationships and early dinosaur evolution Baron, M.G.; Norman, D.B.; Barrett, P.M. · 2017 · DOI 10.1038/nature21700 Untangling the dinosaur family tree Langer, M.C.; Ezcurra, M.D.; Rauhut, O.W.M.; Benton, M.J.; Knoll, F.; McPhee, B.W.; Novas, F.E.; Pol, D.; Brusatte, S.L. · 2017 · DOI 10.1038/nature24011