Palaeogeography Palaeoclimatology Palaeoecology, Год журнала: 2025, Номер unknown, С. 113059 - 113059
Опубликована: Июнь 1, 2025
Язык: Английский
Palaeogeography Palaeoclimatology Palaeoecology, Год журнала: 2025, Номер unknown, С. 113059 - 113059
Опубликована: Июнь 1, 2025
Язык: Английский
Alcheringa An Australasian Journal of Palaeontology, Год журнала: 2024, Номер unknown, С. 1 - 23
Опубликована: Сен. 8, 2024
Язык: Английский
Процитировано
4Annals of Carnegie Museum, Год журнала: 2025, Номер 90(3)
Опубликована: Янв. 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.
Язык: Английский
Процитировано
0Journal of Vertebrate Paleontology, Год журнала: 2025, Номер unknown
Опубликована: Фев. 19, 2025
Язык: Английский
Процитировано
0Royal Society Open Science, Год журнала: 2025, Номер 12(5)
Опубликована: Май 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.
Язык: Английский
Процитировано
0Palaeogeography Palaeoclimatology Palaeoecology, Год журнала: 2025, Номер unknown, С. 113059 - 113059
Опубликована: Июнь 1, 2025
Язык: Английский
Процитировано
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