Sampling of extant and fossil amniotes reveals that the diversity of melanosome morphologies increased sharply around the time of the origin of pinnate feathers in maniraptoran dinosaurs (the lineage leading to birds) and independently in mammals; lizard, turtle and crocodilian skin as well as archosaur filamentous body covering shows a limited diversity of melanosome forms, a pattern consistent with convergent changes in the melanocortin system of endothermic animals.
- Quanguo Li
- Julia A. Clarke
- Matthew D. Shawkey
