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The private sale of fossils has attracted criticism from paleontologists, as it presents an obstacle to fossils being publicly accessible to research. [2] Most countries where relatively complete dinosaur specimens are commonly found have laws against the export of fossils. The United States allows the sale of specimens collected on private ...
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 ...
Review of studies of dinosaur reproduction and ontogeny, and of challenges in the studies of dinosaur reproductive biology, is published by Chapelle, Griffin & Pol (2025). [ 17 ] Deiques et al. (2025) report the discovery of new dinosaur tracks from the Upper Jurassic Guará Formation ( Brazil ), including second record of an ankylosaur track ...
An unusually well-preserved dinosaur skeleton, a Camptosaurus known as Barry, will go under the hammer in Paris next month. ... ($1.28 million) when it goes on sale on October 20.
The "classic" definition of archosaur utilized prior to the widespread use of cladistics is now roughly equivalent to the clade Archosauriformes. [5] Archosaurus is still considered the oldest undisputed archosauriform, as well as one of the few valid members of the family Proterosuchidae .
Prestosuchidae (in its widest usage) is a polyphyletic grouping of carnivorous archosaurs that lived during the Triassic. They were large active terrestrial apex predators, ranging from around 2.5 to 7 metres (8.2 to 23.0 ft) in length. They succeeded the Erythrosuchidae as the largest archosaurs of their time. While resembling erythrosuchids ...
A later review by Jose Bonaparte in 1975 synonymized the two species and considered Lagosuchus intermediate between "pseudosuchians" and saurischian dinosaurs. [6] Modern authors now consider at least L. lilloensis to be firmly on the lineage of archosaurs leading to dinosaurs. [5] However, the genus Lagosuchus is regarded by some to be dubious.
Archosaurs include the only living dinosaur group — birds — and the reptile crocodilians, plus all extinct dinosaurs, extinct crocodilian relatives, and pterosaurs. Archosaur palaeontology is the scientific study of those animals, especially as they existed before the Holocene Epoch began about 11,700 years ago.