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Articles related to prehistoric sharks

Prehistoric Sharks and Shark Evolution - Dinosaurs - About.com
If you went back in time and looked at the first, unremarkable prehistoric sharks of the Ordovician period--about 420 million years ago--you might never guess ...
http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-sharks.htm
Prehistoric Shark Pictures - Dinosaurs - About.com
The first prehistoric sharks evolved 420 million years ago, and their fierce descendants have survived down to the present day. Here are pictures, illustrations ...
http://dinosaurs.about.com/od/dinosaurpictures/ig/Prehistoric-Shark-Pictures/
Megalodon - About.com Prehistoric Sharks
Enya Kim from the Natural History department at auctioneers Bonhams & Butterfields stands in front of one of the world's largest set of shark jaws comprised of ...
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/megalodon.htm
Cretoxyrhina - About.com Prehistoric Sharks
Sometimes, a prehistoric shark just needs a catchy nickname to attract the attention of the general public. That's what happened with the awkwardly named  ...
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/cretoxyrhina.htm
Stethacanthus - About.com Prehistoric Sharks
In most ways, Stethacanthus was an unremarkable prehistoric shark of the late Devonian and early Carboniferous periods--relatively small, but a dangerous, ...
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/stethacanthus.htm
Squalicorax - About.com Prehistoric Sharks
The only prehistoric shark known to have preyed on dinosaurs.
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/squalicorax.htm
Hybodus - About.com Prehistoric Sharks
This medium-sized shark prowled the seas for over 100 million years.
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/hybodus.htm
Helicoprion - About.com Prehistoric Sharks
The only surviving evidence of the prehistoric shark Helicoprion is a tight, curled- up coil of triangular teeth, a bit like a fruit roll-up, but considerably deadlier.
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/helicoprion.htm
Xenacanthus - About.com Prehistoric Sharks
As prehistoric sharks go, Xenacanthus was the runt of the aquatic litter--the numerous species of this genus measured only about two feet long, and had a very ...
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/xenacanthus.htm
Orthacanthus - About.com Prehistoric Sharks
This prehistoric shark had a distinctive spine on its head.
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/orthacanthus.htm
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