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Dinosaurs evolved from archosaurs with this hip arrangement. The hip sockets faced downwards and the knobs on the femurs were in line with the femur. This "pillar-erect" arrangement appears to have evolved independently in various archosaur lineages, for example it was common in "Rauisuchia" (non-crocodylomorph paracrocodylomorphs ) and also ...
Bones from other parts of the body were found in 2009 and 2010. Five tracks made by a three-toed archosaur – presumably a theropod dinosaur – were found in rocks that were 1 metre (3.3 ft) above the layer where Smok was found. The footprints may belong to Smok, but the lack of foot bones in the skeleton make this association uncertain. [1]
Fragment of long bone of a dinosaur is described from the Upper Cretaceous (Santonian–Campanian) sediments near the village of Izhberda (Orenburg Oblast, Russia) by Skutschas et al. (2022), who interpret the histological features of this bone as indicative of rapid continuous growth known in large-sized dinosaurs, and interpret this finding ...
The predentary is an unpaired bone found in front of the dentaries of the lower jaw that formed the lower beak in ornithischians. [1]: 142 Its presence is considered an ornithischian synapomorphy. [99] premaxilla The paired premaxilla (plural: premaxillae) is the frontmost bone of the upper jaw and forms the tip of the snout.
Footprints dating back 120 million years show where dinosaurs were able to cross between land that's now part of two different continents. Matching dinosaur footprints found more than 3,700 miles ...
This tissue may have first appeared in ornithodires, the Triassic archosaur group from which dinosaurs are thought to have evolved. [18] Medullary bone has been found in specimens of sub-adult size, which suggests that dinosaurs reached sexual maturity before they were full-grown. Sexual maturity at sub-adult size is also found in reptiles and ...
An exceptionally preserved, articulated oviraptorid embryo, found inside an elongatoolithid egg in a posture previously unrecognized in a non-avian dinosaur but sharing aspects of bird-like tucking postures, is described from the Upper Cretaceous Hekou Formation (China) by Xing et al. (2021); [202] however, the conclusions of the authors are ...
A study on the duration of Late Cretaceous megaherbivore dinosaur assemblage zones in the 100 m thick stratigraphic section exposed at Dinosaur Provincial Park (Alberta, Canada) is published by Eberth et al. (2023), who interpret their findings as indicating that the dinosaur assemblage zones in the studied section had duration time of ~600 ...