Several Permian shark species found in Arizona

Adam Khor

Including one measuring almost six meters long! Here's a tooth of the big one:

http://news.discovery.com/animals/prehistoric-shark-species-arizona-120813.html

Galvasean

It's quite interesting how the ctenacanthiformes may in fact be a 'dead end' lineage and not closely related to modern sharks at all. One coukd easily forget how diverse sharks have been and how much they have changed down through the ages.

Rubecula

Indeed sharks and relations have filled most niches over time. That tooth looks very impressive too. More of a bone cruncher than a flesh nibbler to my eyes.

Galvasean

The extra 'mini teeth' on the tooth (imagine that, a shark with teeth on its teeth!) remind me s bit of a sand tiger tooth.

Kess73

Hehe great minds think alike. When I saw the first pic I straight away thought of it as being a similar feeder as the Sand Tiger. The same skewering type bite.

Galvasean

Makes you wonder what kind of prey this great white sized predator was skewering...

Myrddin

A shark with teeth on its teeth...how seriously badass does that even sound!