Mandarin Schnauz Dogfish
| Mandarin Schnauz Dogfish | ||||||||||||
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Mandarin Schnauz Dogfish ( Cirrhigaleus barbifer ) |
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| Scientific name | ||||||||||||
| Cirrhigaleus barbifer | ||||||||||||
| Tanaka , 1912 |
The mandarin schnauz dogfish ( Cirrhigaleus barbifer ) is one of the three species of the genus Cirrhigaleus within the dogfish (Squalidae). The range of this species includes several separate areas in the western Pacific . It was not until 2007 that the southern mandarin snout dogfish was delimited from this species, so that the distribution areas off the east coast of Australia and around New Zealand are now assigned to the new species.
Appearance and characteristics
The mandarin snout dogfish is a medium-sized shark with a known maximum length of at least 122 centimeters, with an average length of around 90 to 110 centimeters. He has a stocky body with a broad, flat head. The two long barbels that start at the nostrils and extend to the mouth are striking .
Its back is gray-brown and its belly is lighter; the skin is very coarse compared to other species of shark. The rear edges of all fins are white without any further drawing. It can only be confused with the rough-skinned dogfish ( C. asper ), which, however, has significantly shorter beards and is found mainly on the coasts of Africa and in the Gulf of Mexico . Compared to the southern mandarin schnauz dogfish, this species mainly differs in its anatomical and molecular biological features that are hardly recognizable from the outside, so a distinction can only be made on the basis of the observation area or laboratory tests.
It has no anal fin and two dorsal fins with the order-typical spines in front of the dorsal fins. The first dorsal fin begins behind the end of the pectoral fins and is slightly larger than the second dorsal fin. The pectoral fins are large and broadly triangular. Like all species in the family, the animals have five gill slits and an injection hole behind the eye.
distribution
The range of this species includes several separate areas in the western Pacific . It occurs south of Japan and in the central Pacific, the distribution area also specified in the literature for this shark in the reef areas off the east coast of Australia and around New Zealand is now assigned to the newly described Southern Mandarin Schnauz Dogfish.
Way of life
The mandarin schnauz dogfish lives near the coast above the continental shelf and occurs at depths of 140 to 640 meters. It lives mainly near the ground or directly on the sea floor. There is no information about its food spectrum, it is assumed that the long barbels contain chemoreceptors to track down prey. It is harmless to humans.
Like other species of the order, it is viviparous, with the only documented size of the progeny so far, ten juvenile sharks were present. The sharks reach sexual maturity with a length of 110 to 115 centimeters.
Systematics
The genus Cirrhigaleus currently consists of two or three species: the mandarin schnauz dogfish and the rough-skinned dogfish ( C. asper ) as recognized species, as well as the southern mandarin schnauz dogfish ( C. australis ), which was previously described as the mandarin schnauz- Dogfish includes captured populations off the coasts of Australia and New Zealand and thus the former is reduced to the North Pacific occurrences.
Danger
The Mandarin dogfish is in the red list of the IUCN as "near threatened" ( "near threatened") classified because it rarely sighted in its circulation area or as by-catch caught in fishing.
supporting documents
- ↑ a b William T. White1, Peter R. Last, John D. Stevens: cirrhigaleus australis n sp, a new Mandarin dogfish (Squaliformes: Squalidae).. From the south-west Pacific In: Zootaxa. No. 1560, 2007, pp. 19-30.
- ↑ cirrhigaleus barbifer in the endangered Red List species the IUCN 2009. Posted by: WT White, 2003. Retrieved on October 19 of 2009.
Web links
- Mandarin Schnauz Dogfish on Fishbase.org (English)
- Species portrait of the mandarin schnauz dogfish ( Cirrhigaleus barbifer ) on hai.ch
literature
- Leonard Compagno , Marc Dando, Sarah Fowler: Sharks of the World. Princeton University Press , Princeton 2005, ISBN 978-0-691-12072-0 (Princeton Field Guides), pp. 71-73.