Southern mandarin schnauz dogfish
| Southern mandarin schnauz dogfish | ||||||||||||
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| Scientific name | ||||||||||||
| Cirrhigaleus australis | ||||||||||||
| White , Last & Stevens , 2007 |
The southern mandarin schnauz dogfish ( Cirrhigaleus australis ) is one of the three species of the genus Cirrhigaleus within the dogfish (Squalidae). It was only differentiated from the mandarin snout dogfish ( C. barbifer ) on the basis of molecular biological and anatomical features in 2007 . Its distribution area is in the reef areas off the east coast of Australia and around New Zealand.
Appearance and characteristics
The southern mandarin schnauz dogfish is a medium-sized shark with a body length of about one meter. 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 barbels and occurs mainly on the coasts of Africa and in the Gulf of Mexico . Compared to the Mandarin Schnauz dogfish, this species differs primarily in terms of 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 the reef areas off the east coast of Australia and around New Zealand.
Way of life
The southern 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 kinds of order, it is viviparous.
Systematics
The genus Cirrhigaleus currently consists of two or three species: the mandarin-snouted dogfish ( C. barbifer ) and the rough-skinned dogfish ( C. asper ) as recognized species, as well as the southern mandarin-snouted dogfish ( C. australis ), which was described in 2007 which includes populations off the coasts of Australia and New Zealand that were previously taken as mandarin schnauz dogfish and thus reduced the former to the North Pacific occurrences.
Danger
The Mandarin Schnauz spiny dogfish is classified in the IUCN Red List as a type of warning list ("near threatened") because it is seldom sighted in its range or caught as bycatch in fisheries. Delimited information on the southern mandarin snout dogfish is not available.
supporting documents
- ^ A b William T. White, Peter R. Last, John D. Stevens: Cirrhigaleus australis n. Sp., A new Mandarin dogfish (Squaliformes: Squalidae) from the south-west Pacific. In: Zootaxa. Volume 1560, 2007, pp. 19-30.
- ↑ cirrhigaleus barbifer in the endangered Red List species the IUCN 2008. Posted by: White, WT (SSG Australia & Oceania Regional Workshop, March 2003), 2003. Retrieved on 8 November, 2008.