Table of contents:
- The size
- Life span
- Social structure
- Benefit / harm to humans
Video: Long-spiked Velvet Shark (Proscymnodon Macracanthus)
2023 Author: Molly Page | [email protected]. Last modified: 2023-11-27 22:49
The long-spiked velvet shark, or the larger-spiked velvet shark, is today known in scientific circles only thanks to one specimen (holotype), once caught in the Strait of Magellan. It is in the UK at the British Museum of Natural History. The holotype is female and has a body length of 68 cm. It is assumed that this species is identical to the same poorly studied species Etmopterus paesslen, but there is no confirmation of this yet.
The long-spiked velvet shark, or the larger-spiked velvet shark, has a powerful, stocky body that tapers significantly on either side of the pectoral fins. The snout is moderately long, the mouth is wide, the lips are fleshy and thick. The folds of the upper lip are very short. The branchial slits are oblique and short. The eyes are of medium size.
Sharks of this species have two dorsal fins, the second of which is located below the first. Also, the posterior dorsal fin is shorter and wider than the anterior dorsal fin. Both fins have strong, fairly thick spines that protrude at least 1/3 above the skin. The pectoral fins are large, located just below the first dorsal fin. The pelvic fins are located slightly closer than the second dorsal fin. The caudal fin has a small but well-defined lower lobe. The upper blade is wide and has a characteristic pennant. There is no anal fin. Plakoid scales are large and rare.
The teeth of the upper jaw are subulate, have only one apex in the center. The teeth of the lower jaw are short, with wide small roots. The top is one, located at an angle. The lower teeth fit tightly to each other, forming a kind of continuous cutting "tape" with their oblique tops.
The characteristic color for this shark species is dark brown or black, solid, monochromatic, without blotches and spots.
The holotype caught in the Strait of Magellan was 68 cm long. There is a reasonable assumption that this size is not the maximum. Most likely, like other similar species, long-spiked velvet sharks are capable of reaching large sizes (about 1 meter in length).
Unknown. Presumably about 20-40 years old.
The larger thorny velvet shark has a small habitat. Representatives of this species were found in the southeast (Strait of Magellan) and the southwest of the Pacific Ocean (New Zealand).
It is believed that this species of shark lives at a depth of about 650-920 meters, they lead a bottom life.
Almost nothing is known about nutrition. It is assumed that bottom fish and invertebrates form the basis of its diet.
Most likely, they lead a solitary lifestyle.
Enemies include large, predatory fish that live in a similar environment and at similar depths.
Related article Long-nosed velvet shark (Centroselachus crepidater)
Like other members of this family, spiny-finned white-eyed sharks are believed to be ovoviviparous.
Benefit / harm to humans
Sharks of this species do not have any meaning for the economic and other life of a person: they are not beneficial and do not harm, for obvious reasons.
The conservation status has not yet been determined, as is the number of long-spiked velvet sharks. Some scientists believe that sharks of this species have low resistance to external influences and a low rate of reproduction.
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