Sous la surface

Mercredi 20 juin 2012 à 21:27

Si je vous dis "crevette-mante" à quoi pensez-vous?

Eh bien la crevette-mante ou Stomatopoda de son vrai nom ou encore Squille n'est ni une crevette, ni une mante mais un curieux crustacé haut en couleur qui possède des pinces repliées comparables à celle de la mante religieuse d'où son nom.
Une vision exceptionnelle!
Une des particularités de la squille est sa vision. En effet, son système visuel est l'un des plus sophistiqués de tout le règne animal!

1/ Champ visuel
     Les yeux de la crevette-mante, bougent en pivotant indépendamment l'un de l'autre, ce qui lui permet d'obtenir à 360°.

2/ Vision en relief
      Chaque œil est composé de 3 sections, chacune ayant une pseudo-pupille indépendante. Leurs fonctions étant similaires aux pupilles humaines, elles lui permettent de réaliser une triangulation de l'objet visualisé, et de connaitre avec précision sa distance et sa profondeur, en n'utilisant qu'un seul œil. (Petit rappel: la vision en relief chez l'Homme est en partie due au fait que nous avons 2 yeux!)

3/ Perception des couleurs et de la lumière

     La squille est capable de voir en couleur. Chaque oeil possède 12 photopigments (contre 3 voire 4 dans certains cas pour l'Homme). De plus, elle est capable de voir la lumière polarisée et de détecter la lumière fluorescente. Enfin, elle possède des récepteurs pour la lumière ultraviolette et peut voir jusqu'à une longueur d'onde de 300 nm (contre 380nm pour l'Homme)

  Une boxeuse née!
    Une autre caractéristique de la crevette-mante est leurs pinces dotées d'une très grande force grâce elles sont capables de briser coquilles, carapaces et même la paroi d'un aquarium! Des chercheurs américains ont percé le secret de ses appendices : une surface dure recouvre un assemblage de fibres élastiques microscopiques qui absorbent les chocs. La squille devrait permettre de fabriquer des gilets pare-balles plus légers et plus résistants. (Il fallait bien se douter qu'ils n'allaient pas autant investir dans les recherches sur un si petit animal par simple curiosité scientifique, hein...)

   Saveurs d'ailleurs...
     Enfin, sachez que la squille-mante est consommée dans le Pacifique, mais aussi dans une partie de la Méditerranée (mer Adriatique) où vit l'espèce Squilla mantis. Et enfin, au Japon où elle est connue sous le nom de shako.

 Pour finir, une petite vidéo montrant cette petite bête à l'action face à une palourde (je crois).


Par caf accueil le Jeudi 21 juin 2012 à 12:59
Il est super cool ce crustacé, et a cette ci ça me donne faim!

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