Spider is not an insect??? @_#

i wonder, is spider an insect? God knows.

Credits to: http://wiki.answers.com/Q/Why_is_a_spider_not_considered_an_insect

Why spider is NOT considered as an insect???

Because it only has 8 legs. lol.
Spiders belong to the class of arachnids which also includes scorpions, ticks and mites. None of these are actually classed as insects. Unlike insects they have eight legs, eight eyes in most cases, no wings,and only two, not three parts to their bodies.


so basically, below are the characteristics of the so-called arachnids :

Arachnids (pronounced uh-RACK-nidz; class Arachnida) form the second-largest group of land arthropods (phylum Arthropoda) after the class Insecta. There are over 70,000 species of arachnids that include such familiar creatures as scorpions, spiders, harvestmen or daddy longlegs, and ticks and mites, as well as the less common whip scorpions, pseudoscorpions, and sun spiders. The marine horseshoe crabs and sea spiders are near relatives.

Physical characteristics

Arachnids have paired, jointed appendages (parts that are attached to the main body), a hardened exoskeleton (exo means "outer"), a segmented (divided into parts) body, and a well-developed head. Their body consists of two main parts: a fused head and thorax, and an abdomen. There are six pairs of appendages on the body: the first pair are clawlike fangs near the mouth used for grasping and cutting; the second pair serve as general-purpose mouth parts that may be modified for special functions; and the last four pairs of appendages are the walking legs.
Most arachnids live on land and breathe by means of book lungs (socalled because their thin membranes are arranged like the pages of a book) or by tracheae (small tubes that distribute air from the outside throughout the body), or both. Most are flesh-eating predators. They feed by piercing the body of their prey and directly consuming its body fluids or by releasing digestive secretions that predigest the food before they eat it.

more info pls log into :

http://www.scienceclarified.com/Al-As/Arachnids.html


Here i m sorry to all my science teacher~~~T_T i only know this at this very moment~~~