As the first post of the year - if we exclude the cards - I could not choose a topic a bit 'scollacciato. Or better yet, a serious subject, but with some aspects, like, itchy ...
What you see in the picture is a copy of a Phoneutria , commonly known as the Brazilian wandering spider.
The genus Phoneutria (in greek "killer") contains eight species described analytically. These specimens can grow up to 13-15 cm, and are called vagrants because they love hunt at night in the jungle, rather than sit in burrows or in the midst of silky webs. By day they hide in termite nests, under stones, in kinda bananas, the P. Nigriventer particularly lurks in dark, damp places close - and not infrequently in - human settlements. Would be nothing were it not that the poison of Nigriventer has been classified as the most toxic in the world .
PhTx3 toxin acts as an inhibitor of calcium ion channel, preventing the signals between neurons, proper electrical impulses, to "travel" on their "highway" confidential. In practice after a bite of this little girl, do not feel pain because brain does not receive the message from the affected muscle, but even more we do not control our muscles, because muscles do not receive the message from the brain. Simply put this poison in high concentrations due to paralysis, asphyxiation and death.
At low concentrations however, it is to have fun (but not): The bite of Phoneutria cause painful erections in men and durable, with all the same symptoms of priapism , a disease that you might like only the first 5 minutes.
Fortunately, these spiders have evolved: they developed their chelicerae to bite small prey and inject poison in any case only 1 / 3 of cases, and in quantities minimum (in contrast to the species as primitive spiders Atrax that when they bite you "empty" of poison).
But when they bite, and bite "good", the question is hard, apparently.
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