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An antorbital fenestra (plural: fenestrae) is an opening in the skull that is in front of the eye sockets. This skull character is largely associated with archosauriforms, first appearing during the Triassic Period. Among extant archosaurs, birds still possess antorbital fenestrae, whereas crocodylians have lost them. The loss in crocodylians ...
The pelvic anatomy of Cricosaurus and other metriorhynchids [41] and fossilized embryos belonging to the non-archosaur archosauromorph Dinocephalosaurus, [42] together suggest that the lack of viviparity among archosaurs may be a consequence of lineage-specific restrictions. [clarification needed]
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 .
Description of the anatomy of the inner skull cavities of Diplocynodon tormis is published by Serrano-Martínez et al. (2025). [13] Pligersdorffer, Burke & Mannion (2025) reconstruct the endocranial anatomy of Argochampsa krebsi, and report evidence of presence of salt glands in the studied gavialoid. [14]
The skull of Proterosuchus, an early archosauriform. Note the long rear branch of the downturned premaxilla and the L-shaped quadratojugal near the jaw joint. Most archosauromorphs more "advanced" than Protorosaurus possessed an adaptation of the premaxilla (tooth-bearing bone at the tip of the snout) known as a posterodorsal or postnarial process.
"Rauisuchia" is a paraphyletic group of mostly large and carnivorous Triassic archosaurs. [2] Rauisuchians are a category of archosaurs within a larger group called Pseudosuchia, which encompasses all archosaurs more closely related to crocodilians than to birds and other dinosaurs.
A study on the skull anatomy of a well-preserved new specimen of Jeholornis, and on the morphometrics of the mandible and cranium of Jeholornis is published by Hu et al. (2022), who interpret their findings as indicating that Jeholornis consumed fruits, and raising the possibility of seed dispersal by early birds. [309]
Skull and neck vertebrae of the abelisaurid theropod Carnotaurus with clearly visible epipophyses. In this genus, the epipophyses are greatly enlarged. Epipophyses are bony projections of the cervical vertebrae found in archosauromorphs, particularly dinosaurs (including some basal birds). [1]