Dagger-nosed shark

Dagger-nosed shark
	Dagger-nosed shark ( Isogomphodon oxyrhynchus ) ; (illustration)
Systematics
without rank:	Sharks (selachii)
Superordinate :	Galeomorphii
Order :	Ground Sharks (Carcharhiniformes)
Family :	Requiem sharks (Carcharhinidae)
Genre :	Dagger-nosed sharks
Type :	Dagger-nosed shark
Scientific name of the genus
	Isogomphodon
	Gill , 1862
Scientific name of the species
	Isogomphodon oxyrhynchus
	( Müller & Henle , 1839)

The dagger-nosed shark ( Isogomphodon oxyrhynchus ) is the only known representative of the genus Isogomphodon within the Requiem sharks (Carcharhinidae).

Appearance and characteristics

The daggernose shark is characterized by its long and pointed snout solid and the existing of slender pointed teeth and dentures . These have the same shape in the upper and lower jaws and, with up to 60 teeth, are much more numerous than all other representatives of the requiem sharks. The cutting edges are finely sawn. It is uniformly gray with a lighter underside and reaches a maximum size of about 1.50 meters.

Way of life

The dagger-nosed shark specializes in catching small schooling fish. Its teeth form a trap that can be optimally used to pack this prey. The young are born alive and are about 40 centimeters long at birth.

distribution

Distribution areas (blue) of the dagger-nosed shark

The dagger-nosed shark is widespread in the tropical waters of the western Atlantic between Trinidad and Guinea and off the coast of northern Brazil .

Danger

The population has decreased by 90% in the last 10 years. Because of the slow rate of reproduction and because this shark repeatedly ends up in gill nets as bycatch, the species is critically endangered.

Individual evidence

↑ Isogomphodon oxyrhynchus in the IUCN Red List of Threatened Species 2013.2. Posted by: Lessa, R., Charvet-Almeida, P., Santana, FM & Almeida, Z., 2006. Retrieved October 16, 2018.

literature

Kuno Sch. Steuben : The sharks of the seven seas: species, way of life and sporting catch. Parey, Berlin 1989; Page 101. ISBN 3-490-44314-4

Web links

Commons : Dagger-nosed Shark - Collection of images, videos and audio files

Dagger-nosed shark on Fishbase.org (English)
Isogomphodon oxyrhynchus inthe IUCN 2013 Red List of Threatened Species . Posted by: Lessa, R., Charvet-Almeida, P., Santana, FM & Almeida, Z., 2006. Retrieved October 16, 2018.

[1] Isogomphodon oxyrhynchus in the IUCN Red List of Threatened Species 2013.2. Posted by: Lessa, R., Charvet-Almeida, P., Santana, FM & Almeida, Z., 2006. Retrieved October 16, 2018.