Hybodontiformes - AbsoluteAstronomy.com

Hybodontiformes was an order of sharks, they were characterised by possessing 1-2 pairs of hooked protrusions on their heads.

External links

http://www.palaeos.com/Vertebrates/Units/070Chondrichthyes/070.600.html#Hybodontiformes
http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/chondrichthyes/elasmobranchii/hybodontiformes/hybodontiformes.html

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