Hawk-tailed dogfish
| Hawk-tailed dogfish | ||||||||||||
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Hedge- tailed dogfish ( Parmaturus xaniurus ) |
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| Scientific name | ||||||||||||
| Parmaturus xaniurus | ||||||||||||
| ( Gilbert , 1892) |
The hawk- tailed dogfish ( Parmaturus xaniurus ) is a species from the Pentanchidae family that occurs on the North American Pacific coast from central California to the Gulf of California .
features
The hawk-tailed dogfish can reach a maximum body length of 55 cm (females 47 to 55 cm, males 37 to 45 cm). Like many deep-sea species, it has a relatively soft body. Its muzzle is short, wide and rounded, the nasal valves wide and triangular. The first dorsal fin lies directly behind the attachment of the pelvic fin. The second dorsal fin is almost the same size as the first and begins almost exactly above the approach of the larger anal fin. On the upper edge of the caudal fin there is a series of enlarged skin teeth . As with Parmaturus pilosus , the hawk-tailed cat shark's liver has a high concentration of squalene , which may help with buoyancy.
Way of life
The hawk-tailed dogfish lives on the shelf and in the upper part of the continental slope at depths of 90 to 1250 meters and is common but little known. Sightings have also been made from the bottom of the Santa Barbara, which is low in oxygen and inhabited by only a few vertebrates. The as in the Glatthaiart Iago omanensis and the dogfish Cephalurus cephalus enlarged gill area is probably an adaptation to habitats with low oxygen content.
The hawk-tailed dogfish likely feed on live or dead fish. In Santa Barbara Channel copies from eating dead lantern fish observed. Its egg capsules are 7 to 11 cm long, 3 to 4 cm wide and have unusual T-shaped lateral appendages.
Hazards and protective measures
Since the population of this species and current threats are not known, it is listed in the IUCN Red List in the Data Deficient category (insufficient data).
literature
- Leonard JV Compagno , 1984. FAO Species Catalog. Vol. 4. Sharks of the world. An annotated and illustrated catalog of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125 (4/2): 251-655. Rome: FAO.
- William N. Eschmeyer, Earl S. Herald, Howard Hamann: A field guide to Pacific Coast Fishes of North America. From the Gulf of Alaska to Baja California (Peterson Field Guides; 28). Houghton Mifflin, Boston, Mass. 1983, ISBN 0-395-33188-9 .
Web links
- Parmaturus xaniurus on Fishbase.org (English)
Individual evidence
- ↑ Parmaturus xaniurus in the Red List of Threatened Species of the IUCN 2013.2. Posted by: Flammang, BE, Ebert, DA & Cailliet, GM, 2006. Retrieved May 20, 2014.