Sunday, October 30, 2011

Life of Frilled Shark


 
Life of Sea | Frilled Shark (Chlamydoselachus anguineus) | An unique shark was found in Japan. This sea creature was supposedly exist Prehistoric shark. It has an odd shape. It is not like other common sharks All which have almost entirely straight. Well, this shark is known as Frilled shark. Frilled Shark has one or two sharks from the family Chlamydoselachus. They spread in the Atlantic and Pacific Oceans. Rarely is this type of shark found in the outer continental shelf and the continental shelf and bags are generally at the bottom, although there are substantial upward movement.

Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Chondrichthyes
Subclass:     Elasmobranchii
Order:     Hexanchiformes
Family:     Chlamydoselachidae
Genus:     Chlamydoselachus
Species:     C. anguineus


With its elongated, eel-like body and strange appearance, the Frilled shark long compared to the mythical sea serpent. The head is broad and flattened with short, rounded snout. The nostrils are vertical slits, separated into incurrent and excurrent openings leading through a flap of skin. The moderately large eyes horizontally oval and lack nictitating membrane (third eyelid protective). The long jaws are inserted terminally (at the end of the snout), unlike the underslung jaws of most sharks. The corners of the mouth are devoid of front or pleats. 

 
The pectoral fins are short and rounded. The single, small dorsal fin far back on the body, roughly opposite the anal fin, and has a rounded margin. The pelvic and anal fins are large, broad and rounded, and placed well back on the body. The tail is very long and roughly triangular, without a lower lobe and a ventral notch on the upper lobe. There are a pair of thick folds of unknown function along the abdomen, separated by a groove. The abdomen is relatively longer in women than in men, with the ventral fins pushed closer to the anal fin. The dermal teeth are small and the shape of the tip of a chisel, be expanded and focused on the dorsal edge of the caudal fin. This species is dark brown or gray. 

 
The long jaws of the Frilled shark are very elastic with a wide yawn, swallow whole prey making it more than half its size. However, the length and articulation of his jaws means that it can not provide as strong as a shark bite more conventionally built. Most captured individuals were found with little or no identifiable stomach contents, suggesting a rapid digestion rate and / or long intervals between feeds.

The many small, sharp, recurved teeth of the
Frilled shark are functionally similar to squid jigs and can easily hook the body or tentacles of an octopus, especially when they are turned outward when the jaw tasks. Observations of captive sharks swim with their mouths open ruffles suggests that the small teeth, bright against the dark mouth, maybe even crazy octopus to attack and ensnare themselves.

Frilled shark is rarely found in life, and therefore poses no danger to human small numbers collar sharks incidentally caught by several deepwater commercial fisheries in the world, with trawls, gillnets, and longlines. Due to its low reproduction and the continued expansion of commercial fishing in its habitat, as Near Threatened by the International Union for Conservation of Nature (IUCN) .

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