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Pneumatized bones are very light, because they are filled with air instead of the more heavy marrow, which was not only important for active flight, but also for the evolution of gigantism in sauropod dinosaurs. Through the presence of the resulting pneumatic cavities, it has long been known that air sac-like structures predate the origin of birds, since they were found both in the gigantic sauropods as well as in carnivorous dinosaurs. However, when and potentially how many times air sacs did evolve was inaccessible until now.
Filippo Bertozzo was pretty surprised when he analyzed the bone structure in the course of his master's thesis at the Steinmann-Institute for Geology, Mineralogy and Paleontology of the University of Bonn: "Bones that are in contact with air sacs exhibit a unique structure composed of very fine and densely packed fibers. After it turned out that this was true both in modern birds and extinct dinosaurs, we proposed to name this special kind of bony tissue "pneumosteum." "
Fact - Pneumosteum - Bones - Surface - Cavities
Especially astonishing was the fact that pneumosteum was not only restricted to pneumatized bones, but was also found on the surface of conspicuous cavities present in cervical vertebrae of sauropod dinosaurs. Dr. Lambertz adds: "Such cavities had already previously been hypothesized as potential...
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