viernes, 16 de noviembre de 2012

THE PHARYNGEAl JAW OF THE MORAY EEL


THE  PHARYNGEAl JAW OF THE MORAY EEL
They say that the reality overcomes to the fiction. The moray ell that there have found a few investigators of the University of California Davis, at least, the retainer. The animal possesses a double system of jaws, day pupil and boarder. And as the terrifying one 'ally' of the movie of Ridley Scott, the internal ones they emerge towards out to hold to the dam. The magazine 'Nature' publishes an article with the details of the discovery.
It is how if it was one they alien!







Since the fish do not have extremities with which to take hold to his dams, the task of swallowing them is much more difficult than between the terrestrial animals. Normally, "they" 'suck' them at the time that they them try to give the second bite, deeper; everything which turns out to be complicated.
To facilitate the operation many fish have developed the second system of jaws. Thus, the exterior jaws are busy with catching to the dams, whereas the interiores cut and crush the meat. These internal jaws name 'pharyngeal'.

But Rita Mehta and Peter Wainwright, of the University of California Davis, have found something different: a fish that projects his internal jaws towards out to take hold to the dam; to that, at the same time, they hold the exterior jaws. Thus, the dam does not have any way of escaping.
The fish capable of doing this is not a stranger. It is a question of a species of moray ell, a predator known and been afraid by the divers due to his ferocity. The moray ell are fish that live in tropical waters. His aspect is similar to that of the serpents. They lack scales and pectoral and pelvic fins, which one allows them to hide in the orifices of the rocks and corals for, come the moment, to attack his victims suddenly. They can reach up to three meters of length.
There are approximately 200 species of moray ell. Mehta and Wainwright have observed the form in which one of them, the Muraena retifera, capture his dams. When the moray ell has taken hold to the dam with his external jaws, a muscular joint projects it was doing out the jaws faríngeas, that normally are placed behind the cranium. The movement demands the separation of the external low jaw of Superior, as well as a gauging of the backbone. On having done it, the 'neck' of the animal expands extraordinarily. The system of feeding discovered by the Californian investigators is unique between the vertebrates.


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