Actually, a recent study shows that Helicoprion (the shark in the picture) is actually drawn wrong. The spiral teeth are actually inside the sharks mouth, not outside of it.
Source : http://phys.org/news/2013-02-helicoprion-scientists-mysteries-ancient-shark.html
Top Comments
Samekichi Kiseki Moderator
Mar 10, 2014 at 12:27AM EDT
Icecane
Mar 09, 2014 at 10:52PM EDT