Changyuraptor yangi is a newly-described microraptorine dromaeosaur dinosaur from the early Cretaceous (Yixian formation) of Liaoning, China.
The animal would have been around 4 feet long in life, and its fossil shows that it was covered in feathers — including, as in its smaller cousin Microraptor, a pair of “leg wings” represented by long paired pennaceous feathers on the metatarsals and tibiotarsus. One of Changyuraptor's most unique features is its voluminous tail feathers, and these feathers constitute the longest of any known non-avian dinosaur, with the most distal retrices reaching around 30 cm in length.
Changyuraptor is also by far the largest “four-winged” dinosaur known, and while this might not be as big of a deal as it sounds (given that there aren’t very many “four-winged” dinosaurs), it does show that small size wasn’t necessarily the gatekeeper to certain volant adaptations. I personally doubt that this animal was doing anything approaching powered flight, but the long tail feathers and multiple sets of long, well-developed lifting surfaces may have been a boon to gliding and controlled descent. The exceptionally long tail feathers therefore might have been used as a sort of “pitch control” device, wherein a large, relatively heavy animal would have needed especially fine-tuned control over rapid falls onto prey or in safe landings from higher ground. As Buzz Lightyear would say, “This isn’t flying, it’s falling with style!”
Gouache paint on A3-size hot-pressed illustration board, approx. 5-6 hours.
Gang Han et al. 2014. “A new raptorial dinosaur with exceptionally long feathering provides insights into dromaeosaurid flight performance”. Nature Communications. 5: 4382.
From an old reference book. Love these paintings!!!
Australovenator wintonensis was one of a theropod clade known as Megaraptora, which has been at the center of a number of taxonomic realignments in the past couple years. Current analyses place them within Tyrannosauroidea, so although the matter is far from resolved; here they are.
Australovenator first achieved notoriety (albeit not in its own guise) as the ‘Polar/Dwarf Allosaur’ of Walking With Dinosaurs. Known only from ankle material at the time, it wasn’t until further analyses and the description of more material that it was found to be entirely distinct from the allosaurid lineage. It is part of a radiation within the megaraptoran clade which includes the other Australian megaraptoran Rapator and the Japanese Fukuiraptor. The holotype was popularly nicknamed ‘Banjo’, after Australian folk lyricist Banjo Paterson, the author of “Waltzing Matilda”.
A gracile carnivore, Australovenator seems to have measured in at about 20 feet (6 meters) in length, its most obvious means of hunting being the large claws on each hand. Its fossils are known from the Aptian-Cenomanian Winton Formation, which represents a river delta/estuarine environment at the extremity of what then would have been the great inland Eromanga Sea.