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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 ...
General pattern of skull fenestration in archosaurs The most obvious features include teeth set in deep sockets, antorbital and mandibular fenestrae (openings in front of the eyes and in the jaw, respectively), [ 6 ] and a pronounced fourth trochanter (a prominent ridge on the femur ). [ 7 ]
Venaticosuchus is a genus of pseudosuchian archosaurs from the family Ornithosuchidae.Known from a single species, Venaticosuchus rusconii, this genus is described based on an incomplete skull and jaw (as well as a lost partial forelimb and osteoderms) collected from the Late Triassic Ischigualasto Formation in the Ischigualasto-Villa Unión Basin in northwestern Argentina, which was deposited ...
Diagram of the diapsid skull with temporal openings, unlike in anapsids. ... [11] [12] or, more commonly, as a sister group to extant archosaurs. ...
Conversely, a disarticulated skeleton has its bones moved out of their original anatomical compound. A specimen found with its bones disarticulated but in close proximity to each other is termed an associated skeleton. The transition from a completely articulated skeleton to a cluster of isolated and unassociated bones is fluent. [8] astragalus
Labeled diagram of a typical archosaur skull, the skull of Dromaeosaurus. A detailed assessment of archosaur interrelations by Sterling Nesbitt [30] confirmed or found the following twelve unambiguous synapomorphies, some previously known:
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 .
P. fergusi skull diagram. Proterosuchus had mesopic vision, indicating that it was adapted to see well in both bright and dim light. Mesopic vision is characteristic of cathemeral animals, which are active in both night and day, and crepuscular animals, which are active in twilight.