Information about spiders.
Spiders are well known because of their
abundance and because of their interesting instinct. They are mostly
small animals, tarantulas are largest over 2 in. The body is divided
into two distinct parts, joined by a narrow pedicel. The front part is
the cephalothorax; the hind part, the abdomen. Typically bears eight
simple eyes on the front part.There are six pair of appendages attached to the cephalothorax: a pair of pedipalpi, which ordinarily project out in front as feelers but which in the adult males are modified into secondary reproductive organs for transmitting semen to the females during mating; four pairs of walking legs, which are made up of seven segments each and bear two or three claws on the end; and a pair of chelicerae, composed of two segments, a base and a move-able fang, used for grasping prey.
Black Widow Making Web via Wikipedia
The abdomen is usually soft.It bears the spinnerets, from which the silk is spun; these are usually six in number. The silk is used by the spider in making webs, building retreats, making egg cocoons, laying drag-lines. The openings for the reproductive and respiratory organ are on the underside of the abdomen.
Spiders live at all latitudes and altitudes where insects occur, and inhabit all important islands as well as the continents. Spiders are numerous, both as regards individuals and species. They occupy a great variety of habitats, living in burrows in the ground; under-stones, leaves, or trash on the ground; and in houses and basements.
To summarize all spiders posses poison fangs, which are helpful in subduing their prey, few of them are dangerous to man. Except for the black widow and its close relatives and some of the larger tarantulas, they can be ignored by man from the standpoint of poison. Most spiders live only one season, completing their life cycle in a single year, though notably the tarantulas, may live five or more years.
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