The spider belongs to Arthropoda and are not insect,
as it has eight legs and the body divided into cephalothorax and abdomen.
Spiders belong to the class of arachnids and do not have wings. (Insects or exapoda the only arthropods flying wings)Many spiders weave them web, where trap insects, which are the main food. A few species are dangerous to humans, like tarantula whose biting hurts enough, and the black widow, venom which causes nerve paralysis and even death.
Spiders are found in most homes in isolated, dark areas such as attics, underground, under furniture, beneath the apparatus and crevices throughout the house. The spiders often make them on the web high angles of rooms and window sills and there trap insects. Almost all spiders are carnivorous. In 2009 it was discovered that a type of spider is almost exclusively herbivorous but no legs, although belonging to about 40,000 species of carnivorous spiders. From August to October, spiders can be seen frequently.
Females produce a bag of eggs from which emerge her young and pass through various stages to eventually become adults. The mating can be a dangerous event for males, as it can become a meal after.
Impact on humans
In our country, there are an estimated 1,500 species of spiders (officially 856), with the largest percentage of Crete and the Aegean Islands (like Lesvos), while 30% live in damp, icy environment of limestone caves. The most common poisonous species is the “black widow” and “loxoskeli» (loxosceles). Although most spiders are harmless however some spider bites can cause a small red swelling and itching and some other -because of toxin produced from the venom- may cause headache, rash, pain in joints and muscles, muscle spasms, nausea, vomiting, fever and chills, especially if the victim is allergic.