New wallaby-sized dinosaur from the ancient Australian-Antarctic rift valley — ScienceDaily

Reported in the Journal of Paleontology, the new dinosaur is called "Galleonosaurus dorisae," and is the first dinosaur named from the Gippsland area of Australia in 16 years. According to Dr Matthew Herne, a Postdoctoral Fellow at the University of New England, NSW, and lead creator of the new examine, "the jaws of Galleonosaurus dorisae embody younger to mature people -- the first time an age vary has been recognized from the jaws of an Australian dinosaur."

Galleonosaurus was a small-bodied herbivorous dinosaur inside the giant household referred to as ornithopods. "These small dinosaurs would have been agile runners on their powerful hind legs," defined Dr Herne.

The identify Galleonosaurus dorisae refers to the form of the higher jaw, resembling the upturned hull of a crusing ship referred to as a galleon, and in addition honours the work of Dr Doris Seegets-Villiers, who produced her PhD thesis on the palaeontology of the locality the place the fossils had been found.

Galleonosaurus is the fifth small ornithopod genus named from Victoria, which in response to Dr Herne, "confirms that on a global scale, the diversity of these small-bodied dinosaurs had been unusually high in the ancient rift valley that once extended between the spreading continents of Australia and Antarctica." Small ornithopods seem to have thrived on the huge forested floodplain inside the ancient rift valley.

At the time of Galleonosaurus, sediments had been shed from a 4 thousand km lengthy massif of enormous, actively erupting volcanoes that when existed alongside the japanese margin of the Australian continent. Some of those sediments had been carried westward by giant rivers into the Australian-Antarctic rift valley the place they fashioned deep sedimentary basins. However, as these sediments washed down the rivers of the rift valley the bones of dinosaurs, corresponding to Galleonosaurus and different vertebrates, together with the logs of fallen bushes, grew to become combined in. According to Dr Herne, "this land has now vanished, but as 'time-travellers' we get snapshots of this remarkable world via the rocks and fossils exposed along the coast of Victoria."

The new article exhibits that Galleonosaurus dorisae is an in depth relative of Diluvicursor pickeringi; one other small ornithopod named by Dr Herne and his staff in 2018, from excavations alongside the Otway coast to the west of the Gippsland area. Interestingly, "the jaws of Galleonosaurus and the partial skeleton of Diluvicursor had been equally buried in volcanic sediments on the flooring of deep highly effective rivers," defined Dr Herne. "However, Galleonosaurus is about 12 million years older than Diluvicursor, displaying that the evolutionary historical past of dinosaurs in the Australian-Antarctic rift had been prolonged."

The jaws of Galleonosaurus had been found by volunteers of the Dinosaur Dreaming venture throughout excavations close to the city of Inverloch. The most full jaw and the key specimen carrying the identify Galleonosaurus dorisae was found in 2008 by the seasoned fossil hunter Gerrit ('Gerry') Kool, from the close by city of Wonthaggi. Gerry and his spouse Lesley have been instrumental in organizing the Dinosaur Dreaming excavations alongside the Victorian coast for 25 years.

Prior to discovery of Galleonosaurus dorisae, the solely different ornithopod recognized from the Gippsland area was Qantassaurus intrepidus, named in 1999. However, Qantassaurus had a shorter extra strong snout than that of Galleonosaurus, defined Dr Herne, who added, "we consider that these two, similarly-sized dinosaurs fed on different plant types, which would have allowed them to coexist."

The new examine reveals that the ornithopods from Victoria are intently associated to these from Patagonia in Argentina. "We are steadily building a picture of terrestrial dinosaur interchange between the shifting Gondwanan continents of Australia, South America and Antarctica during the Cretaceous period," added Dr Herne

These are thrilling occasions for dinosaur analysis, defined Dr Herne: "Using superior methods, corresponding to 3D micro-CT scanning and printing, new anatomical data is being revealed on dinosaurs corresponding to Galleonosaurus dorisae. These methods are serving to us to delve deeper into the mysterious world of dinosaur ecology -- what they ate, how they moved and the way they coexisted -- and their evolutionary relationships with dinosaurs from different continents."

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