Spider

Scientific Classification :

•     Kingdom: Animalia

•     Phylum: Arthropoda

•     Subphylum:Chelicerata

•     Class: Arachnida

•     Order: Araneae

Spiders are arthropods that have eight legs and chelicerae with fangs that inject venom. Spiders are predators (carnivores), sometimes even cannibals. Its main prey are insects. The study of spiders called ARACHNOLOGI.

Not all spiders make webs to catch prey, but all of them are able to produce silk protein fiber strands that are thinner but stronger from the gland (called spinnerets). Spinneret located on the back of his body. Silk is very useful to help the movement of the spider, swinging from one place to another, trapping prey, making egg sacs, protecting the nest hole, and others.

Spiders has two body parts. The first is front segment  we  can called  Cephalothorax or prosoma, which actually is a combination of head and chest (thorax). Second  part is rear segment  we can called Abdomen (stomach) or opisthosoma. Between cephalothorax and abdomen are thin connective we can called pedicle or pedicellus.

The spiders do not have mouth or teeth to chew. Instead, the mouth of the spider form a vacuum to suck the body fluids of its prey. Eye on spiders generally a single eye (single lens eye), and not like the compound eyes of insects. Most spiders have poor eyesight is not so good, can not distinguish colors, or just on dark and light sensitive.

To mark the presence of prey in general spiders rely on vibration, both on the web of silk and in soil, water, or where its host. There is also a spider that is capable tasted the difference in air pressure. The sense of touch a spider located at the hairs on his legs.

Order spider is further divided into three major categories at the level of suborder, namely Mesothelae, Mygalomorphae or Orthognatha, Araneomorphae.

Spiders live live in some places, like in the forest, in the roof house, and in the wall house. In the forest, the spiders can live in a tree. In the roof spiders live on the ceiling. In the wall house, the spiders usually walk and live by make spiders web.

By:  BIRGITTA MARIA