Requiem shark

A young tiger shark ( Galeocerdo cuvier )

The requiem sharks ( Carcharhinidae ) form a basis for the order of the Sharks ( Carcharhiniformes ) associated family of sharks ( Selachii ). Sometimes they are also referred to as human sharks and gray sharks, although the latter term is used also for the family of Kammzähnerhaie, or they are called after the name of order ground sharks. Requiem sharks are used worldwide in all maritime waters of the tropical and temperate latitudes and are also found in brackish water, for example, before estuaries, and freshwater. Its scientific name is derived from the Greek karcharos, "sharp" and rhis ( genitive rhinos ), "nose" from. The current name comes from the German American, requin by folk etymology from the French word for " shark "

Appearance and characteristics

The usually between one and seven to eight meters long, gray-brown colored Requiem Sharks have an anal fin and two dorsal fins, one of which is front higher than the rear, and are also characterized by five gill slits, round eyes with special eyelids and blade-like unicuspid teeth.

Way of life

Requiem sharks are strong swimmers and feed on prey on various fish, including other sharks, squid, crustaceans, turtles and marine mammals such as seals and occasional sea birds. The females are viviparous.

Phylogeny

The closest relatives of the group are believed to be the weasel sharks ( Hemigaleidae ). From the geological period of the lower Eocene, the first fossils are known.

System

One distinguishes twelve genera with about 50 species, of which the genus Carcharhinus with 32 species is the largest in the family. In this is found, for example, the blacktip reef shark ( Carcharhinus melanopterus ).

Family Requiem sharks ( Carcharhinidae ( Jordan & Evermann, 1896) )

  • Carcharhinus ( Blainville, 1816)
  • Tiger sharks ( Galeocerdo ( Müller & Henle, 1837) )
  • River Sharks ( Glyphis ( Agassiz, 1843) )
  • Dagger nose sharks ( Isogomphodon ( Gill, 1862) )
  • Wide fin sharks ( Lamiopsis ( Gill, 1862) ) (L. temminckii L. tephrodes )
  • Gooks shark ( Loxodon ( Müller & Henle, 1838) )
  • White nose sharks ( Nasolamia ( Compagno & Garrick, 1983) )
  • Lemon sharks ( Negaprion ( Whitley, 1940) )
  • Blue sharks ( Prionace ( Cantor, 1849) )
  • Sharp-nose shark ( Rhizoprionodon ( Whitley, 1929) )
  • Spade nose shark ( Scoliodon ( Müller & Henle, 1837) ) ( p p laticaudus macrorhynchos )
  • White tip reef sharks ( Triaenodon ( Müller & Henle, 1837) )
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