Squaliformes - Wikipedia Sharks portal; The Squaliformes ˌ s k w ɒ l ɪ ˈ f ɔːr m iː z are an order of sharks that includes about 126 species in seven families Members of the order have two dorsal fins, which usually possess spines, they usually have a sharp head, no anal fin or nictitating membrane, and five to seven gill slits
FAO SPECIES CATALOGUE FAO SPECIES CATALOGUE VOL 4 SHARKS OF THE WORLD An Annotated and Illustrated Catalogue of Shark Species Known to Date Part 2 - Carcharhiniformes prepared by Leonard J V Compagno J L B Smith Institute of Ichthyology Grahamstown, South Africa Prepared with support from the United Nations Development Programme (UNDP) and the American
Sharks Rays - Scientific Classification | United Parks . . . The earliest evidence of the ancestors of modern sharks are isolated spines, teeth, and scales that appeared 350 to 400 million years ago in the Devonian Period, known as the "Age of Fishes" Cladoselache, an ancient shark with fossils dating back 400 million years, was found near Cleveland, Ohio This shark featured many characteristics of
Whale shark (Rhincodon typus) biology and ecology: A review . . . While the majority of papers on whale sharks in this period dealt with distributional records, there were several that tried to link whale shark occurrence with currents, monsoons, fish species and plankton (Gudger, 1932, Gudger, 1934, Deraniyagala, 1959, McCann, 1954, Thorp, 1965, Kulkarni, 1948, Gopalan, 1963)
Shark attacks are rare. But heres what to do if you . . . - NPR At least six people were injured in shark attacks in the U S since the July Fourth weekend Such attacks are actually rare, but experts say to stay calm and move away slowly if a shark approaches