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A 69-million-year-old skull found in Antarctica belonged to what scientists say is the oldest known modern bird.. An early relative of the continent’s ducks and geese, it lived off the Antarctic ...
A near complete skull fossil found in Antarctica has revealed the oldest known modern bird — a mallard duck-size creature related to the waterfowl that live by lakes and oceans today, a new ...
The holotype of the partial skull shows evidence of promiment upper and lower canine teeth. [1] The genus name Rhigosaurus comes from the Greek rhigos, meaning cold, and sauros, meaning lizard or reptile. The name was coined by Edwin Harris Colbert and James William Kitching, who described the species in 1981 based on a fossil found in 1970 ...
The animals inhabiting Antarctica at this time would still have had to endure long periods of darkness during the winter, much like in modern-day Antarctica. [18] Despite being found in marine sediment, Antarctopelta, like all ankylosaurs, lived on land. Other ankylosaurs have also been found in marine sediments, likely as a result of carcasses ...
A desmostylian skull has an elongated and broadened rostrum, with the nasal opening located slightly dorsally. The zygomatic arches are prominent (behind the eyes), the paroccipital processes elongated (downward-pointing processes behind the jaw-joints), and the epitympanic sinuses open into the temporal fossae (cavities above the ear holes).
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A 2020 study found numerous differences between the skulls of large and small specimens, formalizing the proposal to divide the two into separate species. Moreover, a histological investigation revealed that one small specimen, PIMUZ T 1277, was a skeletally mature adult at a length of only 1.5 meters (4.9 ft).
In addition, the horns are more elongated, the parietals have a convex upper surface, and the rear edge of the skull is more strongly and smoothly curved. While juvenile members of D. magnicornis also have a smoothly curved rear edge of the skull, all known D. brevirostris specimens are clearly adults as shown by their robust skull ...