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CLADOSELACHIFORMES

The board gills subclass is the group of a shark and the ray where gills of several lines formed the side of the body and a line below. This friend appeared in the beginning in Devonian period in the Paleozoic era. As for Cladoselachiformes which appeared in the latter period in Devonian period (from 367,000,000 years to 362,500,000 years before), the point where there was a mouth before the first of the body was slightly primitive, but it had already possessed the pectoral of a special big triangle to a shark and did today's shark and the figure which did not almost change. There is a big splinter before the fin of two pieces of front and back of the back.

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