The Phylum Arthopoda is the largest in the animal kingdom. Members of the Class Archnida are nearly all land animals which breath through gill-like structures called booklungs. The bodies are divided into two main parts viz. the prosoma and the abdomen.
The prosoma carries the two pairs of appendages, called the chelcerea and the pedipalps and 4 pairs of legs. Arachnids are normally aggressive, predatory creatures that prey on other arthropods and even vertebrates!