Cretaceous Research, Journal Year: 2024, Volume and Issue: unknown, P. 106075 - 106075
Published: Dec. 1, 2024
Language: Английский
Journal of Systematic Palaeontology, Journal Year: 2024, Volume and Issue: 22(1)
Published: June 21, 2024
Resolving the evolutionary relationships of early diverging ('basal') ornithischian dinosaurs is a challenging topic in palaeontology, with multiple competing hypotheses on phylogenetic heterodontosaurids, 'hypsilophodontids', and other early-diverging forms. These cannot be directly compared because they are derived from differently constructed datasets (i.e. distinct samples taxa characters). This study aims to address these issues by revising combining into single analysis order create most comprehensive dataset for investigation ornithischians. A diphyletic model Dinosauria supported, silesaurs nesting as members Ornithischia. Heterodontosauridae resolved clade non-genasaurian ornithischians, rejecting potential relationship Marginocephalia. 'Hypsilophodontid' span neornithischian ornithopod stem, Thescelosauridae sister taxon Cerapoda. more restricted Ornithopoda composed five main clades: Hypsilophodontidae, Rhabdodontomorpha, Elasmaria, Dryosauridae Ankylopollexia. Hypsilophodontidae valid clade, reduced two European Barremian taxa. Rhabdodontomorpha does not contain Muttaburrasaurus originally proposed, but instead expands include North American formed Convolosaurus, Iani Tenontosaurus. Elasmaria contains all non-dryomorph Gondwanan ornithopods, its possessing body plans. New results comparison previous studies suggest that some 'true dryosaurids' various euiguanodontians may closely related either or Results group 'hypsilophodontids' larger clades, significantly reducing number extension ghost lineages throughout Neornithischia. clades also show degree endemism, different present at continents Late Cretaceous. new unifying works will provide framework future origins relations attempting find stability among hypotheses.
Language: Английский
Citations
12
Publicación Electrónica de la Asociación Paleontológica Argentina, Journal Year: 2025, Volume and Issue: unknown, P. 31 - 48
Published: April 10, 2025
En el centro-sur de la Provincia Chubut se exponen excelentes afloramientos rocas sedimentarias edad cretácica que conforman principal relleno cuenca del Golfo San Jorge. Dentro esta destacan por su abundancia vertebrados fósiles, Formación Bajo Barreal (Cenomaniano temprano–Turoniano tardío) y Lago Colhué Huapi (Coniaciano–Maastrichtiano). Aunque registro está mayormente dominado dinosaurios saurisquios, hallazgos fósiles ornitisquios, específicamente ornitópodos, han incrementado en los últimos años. contribución pretende ampliar conocimiento ornitópodos basales Notohypsilophodon comodorensis Sektensaurus sanjuanboscoi provenientes las formaciones Huapi, respectivamente. También, primera vez, abordan describen aspectos sobre paleohistología ambos ornitópodos. Asimismo, con evidencias cuentan al momento a espera nuevos estudios resuelvan mejor relaciones sistemáticas base Ornithopoda, sugiere elasmarios habrían originado este Gondwana, probablemente durante Cretácico temprano, posteriormente dispersado oeste dicho supercontinente, donde alcanzaron tamaños corporales mayores. Por último, menos Patagonia central, observa una selección ambiente entre (elasmarios) derivados (hadrosáuridos). Los primeros desarrollado ambientes tierra adentro climas cierta estacionalidad, mientras hadrosáuridos seleccionado cercanos mar un clima más homogéneo.
Citations
0
Cretaceous Research, Journal Year: 2024, Volume and Issue: 165, P. 105983 - 105983
Published: Aug. 17, 2024
Language: Английский
Citations
0
Cretaceous Research, Journal Year: 2024, Volume and Issue: unknown, P. 106075 - 106075
Published: Dec. 1, 2024
Language: Английский
Citations
0