The evolutionary origin of propatagium, a wing structure, has long-baffled scientists - until now.
It is known that certain lineages of the dinosaurs that lived millions of years ago gave rise to current birds. In order to explain some of the distinctive characteristics of birds, such as feathers and bone structure, experts have turned to dinosaurs.and Velociraptor, had arms rather than wings.
The propatagium comprises soft tissues that do not fossilize effectively, if at all. Therefore, it may not be able to find direct proof. Instead, scientists were forced to devise a ruse to ascertain whether or not a propatagium was present in a specimen.“The solution we came up with to assess the presence of a propatagium was to collect data about the angles of joints along the arm, or wing, of a dinosaur or bird,” said Yurika Uno, a graduate student at Hirasawa's lab.
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