Spade-nosed sharks

Spade-nosed sharks
	Spade-nosed shark ( Scoliodon laticaudus ) from the first description by Müller & Henle, 1838
Systematics
Subclass :	Plate gill (Elasmobranchii)
without rank:	Sharks (selachii)
Superordinate :	Galeomorphii
Order :	Ground Sharks (Carcharhiniformes)
Family :	Requiem sharks (Carcharhinidae)
Genre :	Spade-nosed sharks
Scientific name
	Scoliodon
	Müller & Henle , 1837

The spade-nosed sharks ( Scoliodon ) are a genus of Requiem sharks (Carcharhinidae) that contains two species. The spadenose shark ( Scoliodon laticaudus ) is in much of the Indian Ocean and the Red Sea spread, while Pacific Spadenose Shark in West pacific lives.

Appearance and characteristics

The spade-nosed sharks are slender sharks with a body length of around 50 to 70 centimeters. They resemble the sharks of the genus Carcharhinus in habit , but have a long, extremely flattened snout. They have an anal fin and two dorsal fins , the second dorsal fin being significantly smaller than the first and the anal fins. The first dorsal fin is triangular in shape and starts clearly behind the pectoral fins. The rear end of the first dorsal fin lies over the pelvic fins. The anal fin is much larger than the second dorsal fin. There is no spray hole and the eyes are relatively small with nodding skins.

Compared to Scoliodon laticaudus , the head of Scoliodon macrorhynchos is shorter, the anal fin is slightly longer and the clasps of the males are slightly shorter.

Way of life

Spade-nosed sharks are shallow-water species and predatorily feed on various fish , especially bottom types. The sharks are viviparous and form a yolk sac placenta ( placental viviparous ).

distribution

Distribution areas of the genus Scoliodon

Scoliodon laticaudus is common in large parts of the Indian Ocean from Tanzania to India and Sri Lanka . This is a shallow water inhabitant of the continental shelf who prefers stony grounds. The spade-nosed sharks in the West Pacific from Japan to Indonesia and the Philippines are Scoliodon macrorhynchos , while those in the Bay of Bengal are a third, previously undescribed species, or Scoliodon muelleri , which has been synonymous with Scoliodon laticaudus .

supporting documents

↑ ^a ^b Kuno Sch. Steuben : The sharks of the seven seas: species, way of life and sporting catch. Parey, Berlin 1989, ISBN 3-490-44314-4 , p. 59.
↑ ^a ^b L. JV Compagno, WT White, PR Last: Scoliodon macrorhynchos (Bleeker, 1852), a second species of spadenose shark from the western Pacific (Carcharhiniformes: Carcharhinidae) . In: PR Last, WT White, JJ Pogonoski (Ed.): Descriptions of new Australian Chondrichthyans . CSIRO Marine and Atmospheric Research, 2008, ISBN 978-1-921424-18-2 , pp. 61-76 .

Web links

Commons : Spade-nosed Sharks ( Scoliodon ) - Collection of images, videos and audio files

Spade-nose sharks on Fishbase.org (English)

[Steuben-1] Kuno Sch. Steuben : The sharks of the seven seas: species, way of life and sporting catch. Parey, Berlin 1989, ISBN 3-490-44314-4 , p. 59.

[White_u._a._2008-2] L. JV Compagno, WT White, PR Last: Scoliodon macrorhynchos (Bleeker, 1852), a second species of spadenose shark from the western Pacific (Carcharhiniformes: Carcharhinidae) . In: PR Last, WT White, JJ Pogonoski (Ed.): Descriptions of new Australian Chondrichthyans . CSIRO Marine and Atmospheric Research, 2008, ISBN 978-1-921424-18-2 , pp. 61-76 .