Moggy wrote:Lol for the first time in this thread I was being serious. I was always led to believe that sharks were a type of fish.
In that case, I refer you to this post.
Caliban wrote:Scotticus Erroticus wrote:Mammals came out from the sea, in fact all life did. Perhaps this shark is just showing a bit of the behaviour that eventually led to all sea-life moving from the water to the land? It's a perfectly point to make.
First off, I'd like to take the scientific high road and point out that land-based vertebrae are descended from the class Actinopterygii, whose evolved forms encompass all tetrapods, whereas sharks are Selachimorpha from the Elasmobranchi class. Which encompasses none.
Actinopterygii = lobe-finned, ("traditional") fish.
Sarcoptyrigii (Elasmobranchs) = ray-finned (Sharks, rays etc)
Two completely different evolutionary chains. They share many characteristics, but that's the same as us being like dogs.