Shark - Wikipedia Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head Modern sharks are classified within the division Selachii[1] and are the sister group to the Batomorphi (rays and skates)
Shark Species - Shark Research Institute Facts about many sharks from the eight orders of sharks from the Shark Research Institute (SRI) SRI conducts and sponsors rigorous, peer-reviewed field research about sharks and uses science-based information to educate and advocate for shark conservation policies and protections by the world’s governing bodies, including CITES
Sharks, explained - National Geographic Sharks can rouse fear and awe like no other creature in the sea Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some species are at risk of extinction
Shark | Attacks, Types, Facts | Britannica shark, any of numerous species of cartilaginous fishes of predatory habit that constitute the order Selachii (class Chondrichthyes) Sharks, together with rays and skates, make up the subclass Elasmobranchii of the Chondrichthyes
Shark | Species | WWF - World Wildlife Fund There are more than 1,000 species of sharks and rays, with new species discovered every year These majestic top predators that are so essential to the natural order of marine ecosystems now face their most severe threat from overfishing Many species are threatened with extinction, with some families of rays such as sawfishes in peril
Types Of Sharks: Shark Species List With Pictures Facts - Active Wild Famous types of sharks include requiem sharks such as the tiger shark and blue shark; mackerel sharks such as the great white shark and shortfin mako shark; carpet sharks such as the whale shark; ground sharks such as the great hammerhead, and smaller groups such as angel sharks, catsharks and dogfish
Shark Facts and Information Sharks are a large group of fish that have inhabited the oceans for over 400 million years, even before dinosaurs populated our planet They belong to the superorder Selachimorpha, and modern sharks have specific characteristics like a cartilaginous skeleton, five or six pairs of gills and several rows of teeth
Shark Facts | Fish | BBC Earth Sharks are often characterised as vicious killers, but in reality, they’re a diverse and endangered group of creatures that add tremendous value to marine ecosystems Despite having a reputation as vicious, bloodthirsty predators, sharks are much more benign, varied and diverse than their portrayal in popular culture suggests
Sharks - Smithsonian Ocean There are more than 500 species of sharks swimming in the world’s ocean Yet when most people think of these cartilaginous fish, a single image comes to mind: a large, sharp-toothed and scary beast That generalization does sharks a huge disservice, as they have far more variety than that
Shark Facts, Types, Classification, Habitat, Diet, Adaptations, Pictures Sharks are a group of cartilaginous, predatory fish that belong to the subclass Elasmobranchii Research has shown that they originated more than 400 million years ago The various shark species that exist today can be easily identified by some physical characteristics, mainly the presence of 5-7 gill slits and eight fins