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

Reported in theJournal of Paleontology, the new dinosaur is named"Galleonosaurus dorisae," and is the first dinosaur named from the Gippsland region of Australia in 16 years. According to Dr Matthew Herne, a Postdoctoral Fellow at the University of New England, NSW, and lead author of the new study, "the jaws ofGalleonosaurus dorisaeinclude young to mature individuals -- the first time an age range has been identified from the jaws of an Australian dinosaur."

Galleonosauruswas a small-bodied herbivorous dinosaur within the large family called ornithopods. "These small dinosaurs would have been agile runners on their powerful hind legs," explained Dr Herne.

The nameGalleonosaurus dorisaerefers to the shape of the upper jaw, resembling the upturned hull of a sailing ship called a galleon, and also honours the work of Dr Doris Seegets-Villiers, who produced her PhD thesis on the palaeontology of the locality where the fossils were discovered.

Galleonosaurus是第五个小ornithopod属名叫维克toria, which according 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 appear to have thrived on the vast forested floodplain within the ancient rift valley.

At the time ofGalleonosaurus, sediments were shed from a four thousand km long massif of large, actively erupting volcanoes that once existed along the eastern margin of the Australian continent. Some of these sediments were carried westward by large rivers into the Australian-Antarctic rift valley where they formed deep sedimentary basins. However, as these sediments washed down the rivers of the rift valley the bones of dinosaurs, such asGalleonosaurusand other vertebrates, along with the logs of fallen trees, became mixed 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 shows thatGalleonosaurus dorisaeis a close relative ofDiluvicursor pickeringi; another small ornithopod named by Dr Herne and his team in 2018, from excavations along the Otway coast to the west of the Gippsland region. Interestingly, "the jaws ofGalleonosaurusand the partial skeleton ofDiluvicursorwere similarly buried in volcanic sediments on the floor of deep powerful rivers," explained Dr Herne. "However,Galleonosaurusis about 12 million years older thanDiluvicursor, showing that the evolutionary history of dinosaurs in the Australian-Antarctic rift had been lengthy."

The jaws ofGalleonosauruswere discovered by volunteers of the Dinosaur Dreaming project during excavations near the town of Inverloch. The most complete jaw and the key specimen carrying the nameGalleonosaurus dorisaewas discovered in 2008 by the seasoned fossil hunter Gerrit ('Gerry') Kool, from the nearby town of Wonthaggi. Gerry and his wife Lesley have been instrumental in organizing the Dinosaur Dreaming excavations along the Victorian coast for 25 years.

Prior to discovery ofGalleonosaurus dorisae, the only other ornithopod known from the Gippsland region wasQantassaurus intrepidus, named in 1999. However,Qantassaurushad a shorter more robust snout than that ofGalleonosaurus, explained 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 study reveals that the ornithopods from Victoria are closely related to those 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 exciting times for dinosaur research, explained Dr Herne: "Using advanced techniques, such as 3D micro-CT scanning and printing, new anatomical information is being revealed on dinosaurs such asGalleonosaurus dorisae. These techniques are helping us to delve deeper into the mysterious world of dinosaur ecology -- what they ate, how they moved and how they coexisted -- and their evolutionary relationships with dinosaurs from other continents."