Stoida

Spider

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  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Chelicerata
  • Class: Arachnida
  • Order: Araneae
  • Conservation status: Least concern
  • Areal: worldwide
  • Habitat: almost every habitat on earth
  • Predators: Wasp, Birds, Small mammals
  • Length: 1cm - 25cm (0.5 - 10inch)
  • Lifespan: 1 - 25 years, depending on species
  • Reproduction: 200 - 500 Eggs
spider insect
Origins

Spiders make up the order Araneae Arachnida class. 105 families are known spiders and 10 families missing. In general, two subordinate permitted. Mesothelae suborder contains several primitive.

Opisthothelae suborder contains infra-order mygalomorphae which consists of forms with "straight jaws" usually large as books and tarantula spider, and infra-order araneomorphae, whose members have cheliceraele modified and more effective.

It contains the most common forms even more remarkable orb weaver spider wolf and jumping spiders. Some spiders (cribellate-araneomorphs) have cribellum gland that helps produce silk.

Spider is a common name for 34,000 species of arthropod with eight legs used for walking, extension of the head with pliers and poisonous glands and reproductive organs special the second part of the male body. They often use the silk they secrete.

Like other species of arachnids, spiders are terrestrial, although some species have adapted to life in freshwater, they trapping air bubbles underwater and carandu them after her. Spiders are very numerous and are found worldwide. Although most have less than 1cm in length, the largest has a body of 9 cm and can be much longer legs.

Food Spider

The digestive system of spiders is adapted only liquid food, because animals generally digest their prey outside the body and then ingurgiteaza liquid.

The brain is quite complex. Different parts of it are developed, depending on how they locate prey: by sight or touch.

Spiders are generally carnivorous and eat only raw food, they can crush with claws or she can inject venom. Bite of large spiders can be painful, but most are too small to penetrate human skin, and only a few species are dangerous to humans.

These include "black widow" and its close relatives, but they are not aggressive and bite humans only in defense. The bite is painful and is followed by fainting, shortness of breath. It is rarely fatal, especially in healthy adults. However, care should be provided as quickly as possible.

Features Spider

The spiders body structure is similar to that of other arachnids, being stripped off in a previous part called cephalothorax or ProSom, and a back side, abdomen or opiosthoma called.

The two sides are separated by a "neck" thin animal that gives the flexibility to use their own silk. Cephalothorax typically has four pairs of simple eyes that tend to be larger in hunting spiders and smaller in those who created the intricate webs.

Each first pair of pliers, or chelicerae has a corner with an opening in which the poison is released from the gland came from a clamp end. The next two parts of the body are called Pedipalp, look like legs, but are generally modified to become a kind of antennas.

In the male, Pedipalp has a "body of the probe" used in reproduction. The cephalothorax are four pairs of legs used for walking. Belly modified pliers are used to secrete silk.

The openings of the abdomen, lungs leading to the card, so called because of the layered structure, or a system of tubes (trachea) used to carry the air. Some species can be found both kinds of breath.

A spider silk protein fibrils, which is secreted as a liquid and forming a polymer by stretching is very resilient and resistant as steel. One spider can create different kinds of silk.

Although other invertebrates secrete silk spiders use this ability in most ways. For example, they form wires that helps them find their way and do not let them fall .. small spiders, especially the young, formed parachutes to help them be taken away by the wind, sometimes hundreds of kilometers.

The male used to transfer sperm female silk and silk cocoons it forms. Silk is used to build nests and to align them. The familiar, yet most amazing use is in building insect traps, called "blades". Once prey is caught, spider silk envelops again. Various cobwebs provides an outstanding example of evolution behavior on instincts.

Painjenii do not have to learn to sail, but the technique can adapt to special conditions, such as lack of weight of spacecraft. The simplest are irregular and stretched above the ground. The most advanced are highly developed and oriented so as to intercept the trajectory of flying insects.

Forming blade is a complex process that involves a combination of pieces with some non-sticky sticky. Sometimes more spiders form a kind of common cloth, but in general spiders are not sociable. Such spiders rely mostly on touch.

As predators of insects and small animals, spiders are generally useful people, although some feed on insects pollinating bees. They are a source of prey for other animals as some wasps that paralyze spiders and lay their eggs on their body.

Using silk for clothes was not successful economically, but is used for optical precision. Although spiders have occupied important places in different mythologies, today they are considered repulsive, grotesque and due to the fact that they hide in dark places, but also because of their toxicity exaggeration.

Spider species:

Reproduction Spider

Spiders have two sexes and the eggs fertilized. Male and female genital openings are on the abdomen, but the male organs are structuricomplicate copulatorii found on pliers. He secrete silk in depositing sperm, then moving to tangible bodies.

Once sperm has been transferred to the female, it can be stored in her body for a longer period of time. Mating is often compicat. Males use their silk to recognize partner or close signal is snatching pieces of canvas female.

The spiders view developed, mating is associated with bright colors. The male must avoid being mistaken for female food by it. Males are smaller than females sometimes more. This is seen when the female stops in place.

Males mature faster and sooner they get to a female, the chances are higher to reproduce. Spider eggs are protected in cocoons matase.Femela can guard or you can take it. In some species, the chicks remain with the mother for a longer period and are carrying around her body.

Did you know that:

Bird spider is one of the largest terrestrial invertebrates.

Their venom is more powerful than bees and only attack if provoked.

A spider starred in James Bond in a leading role.

Most species of bird spiders is theraphosa Leblond having 9,5cm

The number of species declined because they were collected and sold as souvenirs.

Those who live in tropical forests are threatened by habitat loss.

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