Arachnida
Arachnida is a class of joint-legged invertebrate animals in the phylum Arthropoda, including spiders, scorpions, ticks, and mites. They are characterized by having four pairs of legs and a body divided into two main segments - the cephalothorax and the abdomen. Arachnids are typically predatory, using venom or silk to capture their prey. They are found in a wide range of habitats worldwide, from deserts to rainforests.