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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 ...
Prehistoric Shark Pictures - Dinosaurs - About.com
Pictures, illustrations and photographs of prehistoric sharks, ranging from Cladoselache to Xenacanthus.
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  ...
Megalodon - About.com Prehistoric Sharks
The giant prehistoric shark Megalodon is one of the few animals to be identified by its species, rather than its genus, name: technically, this predator is known as  ...
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, ...
Cladoselache - About.com Prehistoric Sharks
A strange, scaleless shark of the late Devonian period. ... Cladoselache is one of those prehistoric sharks that's more famous for what it didn't have than for what ...
Squalicorax - About.com Prehistoric Sharks
As with most prehistoric sharks, Squalicorax is known today mainly by its fossilized teeth, which endured much better in the fossil record than its easily degraded ...
Orthacanthus - About.com Prehistoric Sharks
This prehistoric shark had a distinctive spine on its head.
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.
Otodus - About.com Prehistoric Sharks
Since the skeletons of sharks are composed of biodegradable cartilage rather than longer-lasting bone, often times the only fossil evidence of prehistoric ...
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