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Sharks Ocean Fish Corals Fauna Souvenir Sheet of 4 Stamps Mint NH Comoros molluscs Souvenir Sheet Mint NH and novelist of the RomanticSharks Ocean Fish Corals Fauna Souvenir Sheet of 4 Stamps Mint NH Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass