What is spider????????????????

Question

i have heard that spider is not insect it has eight legs insects has 6 legs then in witch category does it fall?

Answer 1

Spiders are predatory invertebrate animals that have two body segments, eight legs, no chewing mouth parts and no wings. They are classified in the order Araneae, one of several orders within the larger class of arachnids, a group that also contains scorpions, whip scorpions, mites, ticks, and opiliones (harvestmen). The study of spiders is called arachnology.

All spiders produce silk, a thin, strong protein strand extruded by the spider from spinnerets most commonly found on the end of the abdomen. Many species use it to trap insects in webs, although there are also many species that hunt freely. Silk can be used to aid in climbing, form smooth walls for burrows, build egg sacs, wrap prey, and temporarily hold sperm, among other applications.

All spiders except those in the families Uloboridae and Holarchaeidae, and in the suborder Mesothelae (together about 350 species) can inject venom to protect themselves or to kill prey. Only about 200 species, however, have bites that can pose health problems to humans. Many larger species' bites may be quite painful, but will not produce lasting health concerns.

Spiders are found all over the world, from the tropics to the Arctic, living underwater in silken domes they supply with air, and on the tops of mountains. In 1973, Skylab 3 took two spiders into space to test their web-spinning capabilities in zero gravity.

Answer 2

Arachnid

Answer 3

Spiders are ancient animals with a history going back many millions of years. They have always been with us, an ancient source of fear and fascination. They are abundant and widespread and are natural controllers of insect populations. Wherever you live, you're always close to a spider.

Spiders are arachnids not insects, but both spiders and insects belong to the largest group of animals on Earth, the arthropods - animals with hard external skeletons and jointed limbs (greek arthro = joint, podos = footed).

Answer 4

There are several taxonomic (the study of characteristics) differences between a spider and an insect.

Spiders are Arachnids, and as such have two main body parts, the cephlathorax (head and thorax combined) and the abdomen, 8 legs, no antennae, and a soft abdomen.

Insects have three main body parts, a head, thorax, and abdomen, 6 legs, and a hard shell (exoskeleton) over their entire body.  

There are other characteristics that separate these two animal types, but those are the most obvious.

Spiders can also extrude webbing from their spinnerets at the tip of their abdomens.  Some insects, especially caterpillars and grubs, can do this, but it's usually in constructing cocoons.  Spider silk is the strongest filament, for its size, known to man.

Spiders are some of the most beneficial animals on our planet, and help a great deal in keeping it healthy and strong.  They do a great job in controlling the insect population.

Answer 5

A spider is an Arachnid. An Arachnid is a joint legged invertebrate animal. The word Arachnid comes from a Greek word meaning spider.

Also why the fear of spiders is called arachnophobia.

Hope that helps.

Answer 6

It is an arachnid related to mites and scorpions.  They are all arthropods which also includes crustaceans and some other groups.

Answer 7

Spiders fall into the Arachnid category.