Rise of the king: Gondwanan origins and evolution of megaraptoran dinosaurs DOI Creative Commons
Cassius Morrison, Charlie Roger Scherer,

Ezekiel V. O’Callaghan

et al.

Royal Society Open Science, Journal Year: 2025, Volume and Issue: 12(5)

Published: May 1, 2025

Late Cretaceous Earth was dominated by theropods such as tyrannosauroids and megaraptorans; however, it is unclear how these clades diversified grew to massive proportions. This study aimed conduct a biogeographical analysis test climate potential mechanism for the increase in size. We used published phylogenetic matrices with R package BioGeoBears different hypotheses both clades. mapped body mass (BM) length against known data this hypothesis. Continental-scale variance did not drive tyrannosauroid biogeography instead widespread ancestral populations, sympatric speciation localized extinctions throughout constricted geographic range. Both patterns were supported statistical analyses. model also indicates ancestor of clade Tarbosaurus Tyrannosaurus present Asia Laramidia, therefore came from Asia. Statistical illustrated no correlation between Mean Annual Temperature (MAT) BM but climatic shifts may be associated gigantism derived megaraptorids eutyrannosaurians. implies megaraptorans have had cosmopolitan distribution prior splitting Laurasia Gondwana. Also, Cretaceous.

Language: Английский

Polar dinosaur tracks of the Wonthaggi Formation (Lower Cretaceous), Victoria, Australia and their palaeontological significance DOI
Anthony J. Martin, Melissa Lowery,

Michael A Hall

et al.

Alcheringa An Australasian Journal of Palaeontology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 23

Published: Sept. 8, 2024

Language: Английский

Citations

4
Morphological and Phylogenetic Significance of the First Adult Humerus of the Patagonian Cretaceous Theropod Megaraptor namunhuaiquii Novas, 1998 DOI
Jorge O. Calvo, Juan D. Porfiri, Alexis M. Aranciaga Rolando

et al.

Annals of Carnegie Museum, Journal Year: 2025, Volume and Issue: 90(3)

Published: Jan. 10, 2025

Megaraptorans are medium- to large-bodied tetanuran theropod dinosaurs known from Cretaceous deposits in Asia, Australia, and especially South America. The megaraptoran skeleton is far well known, the humerus one of least-frequently preserved elements. Here we describe first-documented adult a American megaraptoran, recovered Upper (Turonian–Coniacian) Portezuelo Formation Neuquén Basin on southeast coast Lago Barreales Province, northern Patagonia, Argentina. referred namesake Megaraptor namunhuaiquii Novas, 1998, based its geographic stratigraphic provenance as morphological similarity corresponding element juvenile same taxon. Nevertheless, new exhibits osteological distinctions that interpret reflective their differing ontogenetic stages. We also highlight anatomical differences between M. enigmatic Patagonian Gualicho shinyae Apesteguía et al., 2016, show these taxa not closely related.

Language: Английский

Citations

0
Evolutionary and paleobiogeographic implications of new carcharodontosaurian, megaraptorid, and unenlagiine theropod remains from the upper Lower Cretaceous of Victoria, southeast Australia DOI Creative Commons
Jake Kotevski, Ruairidh J. Duncan, Tim Ziegler

et al.

Journal of Vertebrate Paleontology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Language: Английский

Citations

0
Rise of the king: Gondwanan origins and evolution of megaraptoran dinosaurs DOI Creative Commons
Cassius Morrison, Charlie Roger Scherer,

Ezekiel V. O’Callaghan

et al.

Royal Society Open Science, Journal Year: 2025, Volume and Issue: 12(5)

Published: May 1, 2025

Late Cretaceous Earth was dominated by theropods such as tyrannosauroids and megaraptorans; however, it is unclear how these clades diversified grew to massive proportions. This study aimed conduct a biogeographical analysis test climate potential mechanism for the increase in size. We used published phylogenetic matrices with R package BioGeoBears different hypotheses both clades. mapped body mass (BM) length against known data this hypothesis. Continental-scale variance did not drive tyrannosauroid biogeography instead widespread ancestral populations, sympatric speciation localized extinctions throughout constricted geographic range. Both patterns were supported statistical analyses. model also indicates ancestor of clade Tarbosaurus Tyrannosaurus present Asia Laramidia, therefore came from Asia. Statistical illustrated no correlation between Mean Annual Temperature (MAT) BM but climatic shifts may be associated gigantism derived megaraptorids eutyrannosaurians. implies megaraptorans have had cosmopolitan distribution prior splitting Laurasia Gondwana. Also, Cretaceous.

Language: Английский

Citations

0