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The sea urchins are more known of the group of the echinoderms, are animals that possess in their body a great number of plates or limy shields, wich manage to form a real skeleton, on which nones or projections are implanted, to this they owe their name, since echinoderm means thomy skin, the above mentioned thomy bones are provided with poison and toxic fluids. [ABSTRACT FROM AUTHOR]

The Cat fish constitutes a numerous and dangerous group, to which still they have not discovered the immense quantity of species, nowadays there are catalogued more than 2200 species, which can gather in crowds in 400 kinds and 33 families². His sting can be so serious that in some cases it can lead to gangrene of the affected area and death. [ABSTRACT FROM AUTHOR]

The Scorpion fish are known throughout the world not only by the appearance that they take but also as their skill of attacking to his preys sending poison by his thorns. This family of fish divides principally in Scorpaena, pterosis and synanceja, which constitute a danger for any unprepared swimmer. [ABSTRACT FROM AUTHOR]

Inside the dangerous marine animals for man, one finds the Poisonous Shark, also known as thorny shark. Which belongs to the order of the Escualiform and possesses thorns which can cause stings that can manage to be serious since the manifestations last several days. [ABSTRACT FROM AUTHOR]

The sea snake of the family hydrophiidae is the most poisonous reptile known until today, being typical his tail in the shape of oar, which helps to swim under the sea. This specimen commonly takes their victims to a cardiorespiratory arrest or renal failure. [ABSTRACT FROM AUTHOR]