Dangerous and poisonous marine animals

 Physalia (Physalia aretusa) - this is a colony of polyps, performing various "duties." Afloat support its oval bladder - pneumatophores to 20-30 cm long and 8-10 cm wide, filled with a gas mixture consisting of 12-15% oxygen, 1.18% argon and nitrogen. Interestingly, the shape of the bubble at Physalia living in the northern and southern hemispheres are different, and they will never meet in a "foreign territory". This feature helps siphonophores resist the force of Earth's rotation, the Coriolis force, and provides a "northern" siphonophores move left, and Read more [...]
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Poisonous coelenterates (Coelenterata)

Coelenterates has about 9000 species. It is predominantly marine organisms, only some of them have adapted to fresh water. A characteristic feature is the presence of coelenterates stinging cells (knidoblastov or nematotsitov) that produce poisonous secret and employees for killing prey and defend against enemies. These cells have both generations in a cycle of coelenterates - polyp and medusa. If polyps in the majority - sessile forms that live mostly at relatively shallow depths and prefer rocky ground (in particular, actinin, md), the jellyfish - it's free-floating organisms. All coelenterates Read more [...]
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Venomous animals

Of the oceans, in the coastal zone, among rocks, in quiet lagoons of coral atolls and swampy thickets of mangroves found many poisonous fish, reptiles, jellyfish, clams, representing more or less dangerous to humans. Meeting with them is often unexpected, and the consequences severe. Poisonous jellyfish. It happened on the fifth day of the experiment in the ocean. At 12 o'clock in the boat life becomes unbearable. The only escape from the burning rays of the sun was water. True, the swimming was out of the dream, because together with the boat circling sharks, but scooping up handfuls of Read more [...]
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