Arthropoda

Phylum Arthropoda 

The phylum Arthropoda is used to classify all animals with an exoskeleton and segmented appendages. They are coelomates and have specialized organs that they use for Arthropods are the most diverse group of animals. Ticks, mites, scorpions, spiders, insects, centipedes, millipedes, crustaceans, and horseshoe crabs are all arthropods. 

Class Arachnida Scorpions and spiders are arachnids. An arachnid has two body segments and eight legs. Arachnids can also be venomous. The World's Largest Spider: media type="custom" key="8836320"