Permian Fossil is Earliest Evidence of Rib-Powered Breathing
Paleontologists have examined 289-million-year-old specimens of the early reptile Captorhinus aguti that preserve a covering of three-dimensional skin, a complete shoulder girdle and ribcage with cartilages, and — most astonishingly — protein remnants that predate the previous oldest-known example by nearly 100 million years. Captorhinus aguti. Image credit: Michael DeBraga. The move from water to…
