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looks like a jellyfish but is actually a colony of organisms. with tentacles that reach ten meters.

The Physalia physalis, whose common name is the Portuguese caravel, a family sifonoforo Physalidae.

is often confused with a jellyfish, although a colony of four different types of polyps mutually dependent for survival, with tentacles that reach 10 meters and contain a dozen poisons that, in some cases can cause paralysis and cardiac arrest .


Habitat and distribution.

is widespread in tropical and subtropical seas, but occasionally is also in the western Mediterranean Sea. In the summer of 2009 they have been sighted a colony of about 50 examples off the English coast near Murcia.

Description.

È composta da una sacca galleggiante lunga circa 15 cm costituita da un organismo pneumatoforo. Ad essa sono attaccati dei tentacoli lunghi fino a 30 metri e fortemente urticanti costituiti da individui dattilozoidi incaricati di ricercare e catturare il nutrimento e dirigerlo verso gli individui gastrozoidi. Della riproduzione si occupano invece gli individui gonozoidi.

La parte emersa è di colore azzurro violacea a volte tendente al fucsia. Ha proprietà aerodinamiche che apparentemente sono modificabili tramite contrazioni muscolari della cresta. Galleggia sospinta dal vento ad un'angolazione dipendente dalla curvatura della parte emersa e dalla resistenza della parte sommersa. Ha più di 10 tipi di veleni diversi sui suoi tentacoli, each characterized by its color, are not yet known remedies for some of its poisons. The tentacles of Physalia physalis can cause paralysis and even cardiac arrest of a man.

Nutrition and behavior.

gastrozoidi polyps are part of the "digestive system" of the colony and react quickly to the presence of food to get entangled with the mouth and hook. Digest their food by secreting enzymes that break down proteins, carbohydrates and fats.

driven by the wind while floating in the water by contracting the tentacles fishing, relaxing and catching small fish, crustaceans and other components of the plankton.

Predators.

Octopus Tremoctopus such are immune to the venom of Physalia physalis and are known to tear the tentacles and use them for defensive purposes.

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