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Feathers were very unlikely to have evolved more than once, so assuming that any given dromaeosaurid, such as Utahraptor, lacked feathers would require positive evidence that they did not have them. [17] So far, there is nothing to suggest that feathers were lost in larger, more derived species of dromaeosaurs. [18]
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Family of theropod dinosaurs Dromaeosaurids Temporal range: Cretaceous Pre๊ ๊ O S D C P T J K Pg N A collection of dromaeosaurid fossil skeletons. Clockwise from upper left: Deinonychus antirrhopus (a heavily built eudromaeosaur), Buitreraptor gonzalezorum (a long-snouted unenlagiine ...
Utahraptor (3x)* There was also the carcass of an ornithopod and a video sequence about the Ornithocheirus. Some of the dinosaurs initially did not have feathers, but they were later added after new research showed dinosaurs possessed plumage. [2]
In all examples, the evidence described consists of feather impressions, except those genera inferred to have had feathers based on skeletal or chemical evidence, such as the presence of quill knobs (the anchor points for wing feathers on the forelimb) or a pygostyle (the fused vertebrae at the tail tip which often supports large feathers). [1]
The pterosaur suggests feathers emerged around 250 million years ago through the common ancestor of dinosaurs, birds and pterosaurs -- and shifts the origin of feathers to 100 million years ...
The arms were likely covered in long feathers, and may have been used as flapping stabilizers for balance while atop struggling prey, along with the stiff counterbalancing tail. Its jaws, thought to have had a comparatively weak bite force, [ 46 ] might be used for saw motion bites, like the modern Komodo dragon which also has a weak bite force ...
Cladogram showing distribution of feathers in Dinosauria, as of 2019. The groups that are marked with scales did not necessarily lack feathers but simply have never been found with feather impressions. The following cladogram is from Xu (2020). [66] Slender monofilamentous integument; Broad monofilamentous integument; Basally joining ...
About 148 to 150 million years ago, a strange pheasant-sized and bird-like dinosaur with elongated legs and arms built much like wings inhabited southeastern China, with a puzzling anatomy ...