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The character diagnosis of Tenontosaurus tilletti has been revised andredefined into a more robust and quantifiable state. Significant emphasis isplaced on constructing phylogenetic definition in such a method, as it preventsocclusion of true character states by alleviating potential individualinterpretational bias. Previous placement within the Iguanodontia is refutedbased on the lack of character affinity with the defining synapomorphies of theclade. The clade Hypsilophodontidae (=Hypsilophodontia), along withIguanodontia, however is deemed to be in critical need of refinement to accountfor recent discoveries and re-classifications of certain euornithopods. Severalof the synapomorphies are out-dated and deemed redundant in favour of a morequantifiable approach. Re- definition of these clades is critical if thecurrent state of basal euornithopodan relationships is to be resolved.Phylogenetic studies must be approached from a multidisciplinary perspective;integration of tectonostratigraphical, ontogenetic, palaeoecological, andbiomechanical data with sets of well-defined primary homologies are essentialin increasing phylogenetic resolution and generating stratigraphically feasibleancestor-descendant relationships. Material attributed to Tenontosaurustilletti is in need of strict re-analysis; the significant quantity ofspecimens attributed to this species is potentially the result of poorstratigraphic constraints and the vast spatiotemporal span occupied. Futurerevision of this material is expected to reveal temporal variations on thespecies -level inherently linked to environmental evolution, as well aspossibly provide clues to sexual dimorphism in contemporaneous, yetmorphologically distinct tenontosaurs.

Osteology of a Near-Complete Skeleton of Tenontosaurus tilletti (Dinosauria: Ornithopoda) from the Cloverly Formation, Montana, USA