Collated Shark evolution research

url

https://en.wikipedia.org/wiki/Lemon_shark

Shark anatomy
 + scale chart of former extinct shark alongside current largest sharks - with human as reference

shark and ray anatomy comparison

Paper:

http://www.ijbs.com/v02p0032.htm

Evolution of Chordates:

'Chordate, any member of the phylum Chordata, which includes the vertebrates, the most highly evolved animals, as well as two other subphyla—the tunicates and cephalochordates.'

http://www.britannica.com/animal/chordate

this is the page the evolution of chordates pic was from

This would be interesting to draw as it shows the different directions that evolution takes, but one can still see that they are clearly linked to a common ancestor. My only concern is that it is not directly related to sharks:

http://sharkopedia.discovery.com/shark-topics/prehistoric-sharks/#how-do-experts-know-about-prehistoric-sharks