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  • How fussy eating and changing environments led to the . . .
    However, there are only 15 species of Lamniformes known today (including the great white shark), compared to more than 290 species of Carcharhiniformes (including hammerheads, tiger sharks and
  • The 9 Most Shark-Infested Beaches On Earth - A-Z Animals
    Scientists track sharks here, and there are about 5 sharks in the water every day If you don’t like to surf, check out Granada Boulevard or the shark-free Tomoka River Jacksonville Beach, Florida—This beach is nearly 22 miles long There have been three fatal shark attacks here in the last dozen years
  • The Census of Marine Life - Smithsonian Ocean
    They found life throughout the continental margin, but researchers determined there are more types of deep-sea species at the mid-point of the continental slope, at around 2,000-3,000 meters, where cooler water is pushed up towards the water’s surface
  • Shark tales: A molecular species-level phylogeny of sharks . . .
    Within the class Chondrichthyes, sharks are the second most diverse group, after Batoids, with 494 out of approximately 1200 recognized species, and a diversification dating back some 350 million years (Lawson et al , 1995 in Heinicke et al , 2009)
  • History of Sharks: Earliest Ones. Dinosaur-Era Ones and . . .
    Ancient sharks have left their bite marks on the fossils of numerous dinosaur-era and pre-dinosaur-era paleo creatures including marine mammals, ray-finned fishes and reptiles — even pterosaurs, flying reptiles that lived during the dinosaur age, The oldest evidence of shark-on-shark predation dates to the Devonian period (419 2 million to
  • How to Identify 7 Different Types of Shark Teeth - A-Z Animals
    The megalodon shark tooth is likely one of the most sought-after shark teeth These massive teeth belong to the extinct megalodon that lived an estimated 23 to 3 6 million years ago
  • Shark Cousins: the Skates and Rays - Smithsonian Ocean
    But many ray and skate species are in trouble Overfishing and habitat destruction has led to several populations declining and becoming threatened or endangered Rays are more endangered than sharks, and the Maugean Skate may be the first shark or shark relative to go extinct in modern times


















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