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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
Helicoprion - About.com Prehistoric Sharks
Helicoprion (Greek for "spiral saw"); pronounced HELL-ih-COPE-ree-on. Habitat: Oceans worldwide. Historical Period: Early Permian (270-260 million years ago).
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/helicoprion.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
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
Hybodus - About.com Prehistoric Sharks
Most tellingly, though, Hybodus seems to have been more solidly built than other prehistoric sharks. Part of the reason why so many fossils of this genus have ...
http://dinosaurs.about.com/od/tetrapodsandamphibians/p/hybodus.htm
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