The spider is the name that is attached to this one creature, in any country, of course there are these creatures, for several reasons so that humans are very familiar with this one animal, even in children's films still make these animals as actors main as cast in the film.
While the definition of spiders according to scientific information is respiratory arthropods that have eight legs and chelicerae with fangs that inject toxins. They are the largest arachnid sequence which ranks seventh in total species diversity among all orations of other types of organisms that surround it.
Whereas the uniqueness found in this creature they have the most centralized nervous system of all arthropods. Unlike most arthropods, spiders do not have extensor muscles in their limbs and instead extend it with the hydraulic pressure in their bodies.
Then researchers have discovered a new discovery in the form of a true Spider found in carbonaceous bodies and very similar to the most primitive suborto, Mesothelae. The main group of modern spiders, Mygalomorphae and Araneomorphae, first appeared in the Triassic period which was described in the media.
