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Crawling insects
Spiders
Characteristics:
Spiders are an order of Arachnids, divided, in 2008, into 109 families that include just over 40,000 species.
They are terrestrial chelicerate arthropods with a body divided up into two segments, and eight legs.
The intestine is so narrow that spiders cannot eat any lumps of solid material, however small, and are forced to make their food liquid with the various digestive enzymes, and mill it finely with their masticator apparatus.
The vast majority of spiders only bite a human being in extreme cases of self defence, if directly threatened, in any case, in almost all cases, the irritation only just exceeds that of a mosquito bite or bee sting.
Some species, on the other hand, can produce bites that are fairly serious from a medical viewpoint, such as, to mention the main ones, the recluse spiders and black widows, which only bite if they feel directly threatened, insistently, even if this can occur accidentally.
Araneomorphae and in particular the members of the Agelenidae family, adopt aggressive defence techniques, although rarely go as far as injecting their poison.
In literature, around 100 deaths are attributed to spider bites throughout the whole of the twentieth century, as compared with around 1500 deaths attributed to poison tentacles and stings from jellyfish in the same period.
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