|3D preserved Hamipterus eggs with soft impressions |
showing a soft pliable egg (Wang et al. ).
|Kunpengopterus counterslab and drawing showing 2 eggs|
in black from Wang et al. 
|Outline of eggs from A) the pelvic region, and B) inside the body cavity from Wang et al. .|
This new study provides a lot of interesting information about pterosaur reproduction that we previously didn't know, and of course for me, it's interesting when it comes to the evolution of flight. I'm always interested when people suggest that flight couldn't have evolved without things like the reduction of an oviduct. I think this study shows that mass reduction to achieve flight is not as straight forward or "black and white" as we may have previously thought. Different taxa do different things, and what may be valid in birds, is not valid in pterosaurs, and vice versa.
1. Wang and Zhou. 2004. Pterosaur embryo from the Early Cretaceous. Nature 429: 621.
2. Ji et al. 2004. Pterosaur egg with a leathery shell. Nature 432: 572.
3. Chiappe et al. 2004. Argentinean unhatched pterosaur fossil. Nature 432: 571-572.
4. Want et al. 2014. Sexually dimorphic tridimensional preserved pterosaurs and their eggs from China. Current Biology 24: 1323-1330.
5. Wang et al. 2015. Eggshell and histology provide insight on the life history of a pterosaur with two functional ovaries. Annals of the Brazilian Academy of Sciences.