Sharp nosed sharks

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Sharp nosed sharks
Atlantic Sharpnose Shark (Rhizoprionodon terraenovae)

Atlantic Sharpnose Shark ( Rhizoprionodon terraenovae )

Systematics
Subclass : Plate gill (Elasmobranchii)
without rank: Sharks (selachii)
Superordinate : Galeomorphii
Order : Ground Sharks (Carcharhiniformes)
Family : Requiem sharks (Carcharhinidae)
Genre : Sharp nosed sharks
Scientific name
Rhizoprionodon
Whitley , 1929

The sharp-nosed sharks ( Rhizoprionodon ) are a genus of Requiem sharks (Carcharhinidae). It comprises 7 species and can be found on all subtropical and tropical coasts. The milk shark ( R. acutus ), which is widespread in the eastern Atlantic, is the only species that is very rare in the Mediterranean, where it immigrates via the Strait of Gibraltar .

Appearance and characteristics

The sharp-nosed shark species, which are usually between one and a maximum of 1.75 meters long, have a slim body and are very similar in shape to the representatives of the genus Carcharhinus . They have a long snout and 5 gill slits, and there is no spray hole . Like other requiem sharks, they have an anal fin and two dorsal fins , the front of which is larger than the rear. The eyes are large and the relatively small teeth in both jaws are sloping and toothed.

Way of life

Brazilian Sharpnose Shark ( Rhizoprionodon lalandii )

Sharp-nosed sharks live as shallow water species above the continental shelf or in other shallow sea areas. They feed mainly on fish. The sharks are viviparous and form a yolk sac placenta ( placental viviparous ).

distribution

Distribution areas of the milk shark
Distribution areas of the Pacific Sharpnose Shark

The sharp-nosed sharks can be found in all tropical and subtropical coastal areas. Some species occur in very large areas such as the milk shark, which is distributed from the eastern Atlantic over the entire African coast with the exception of the extreme south and the coasts of the Indian Ocean to the Pacific coasts of Southeast Asia and Australia. Other species are restricted to smaller distribution areas, for example the Pacific Sharpnose Shark is only found on the East Pacific coast from California to Peru.

Systematics

The genus Sharp-nosed Sharks consists of 7 recognized species:

literature

  • Genera Prionace and Rhizoprionodon In: LJV Compagno: Sharks of the world. An annotated and illustrated catalog of shark species known to date. Part 2. Carcharhiniformes. FAO Species Catalog for Fishery Purposes Vol. 4. FAO Rome 1984 ( download ).
  • Kuno Sch. Steuben : The sharks of the seven seas: species, way of life and sporting catch. Parey, Berlin 1989, ISBN 3-490-44314-4 , pp. 100-101.

Web links

Commons : Sharp-nosed Sharks ( Rhizoprionodon )  - Collection of images, videos and audio files

Individual evidence

  1. ↑ Alessandro De Maddalena, Harald Bänsch: Sharks in the Mediterranean. Franckh-Kosmos Verlag, Stuttgart 2005; Page 212. ISBN 978-3-440-10458-3
  2. ↑ Types according to ITIS