User:Abyssal/Prehistory of North America/DYK/53
Appearance
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Rhynchonkos.png/100px-Rhynchonkos.png)
- ... that the Early Permian microsaur Rhynchonkos (pictured) shares many similarities with Eocaecilia, and may be an ancestor of caecilians?
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Arizonasaurus_BW.png/100px-Arizonasaurus_BW.png)
- ... that Arizonasaurus had a large sail along its back made of the spines on its vertebrae?