Arachnid

Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. All arachnids have eight legs, although the front pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs. Almost all extant arachnids are terrestrial. However, some inhabit freshwater environments and, with the exception of the pelagic zone, marine environments as well. They comprise over 100,000 named species, including spiders, scorpions, harvestmen, ticks, mites and Solifugae. For more information visit the Wikipedia Entry Get back to Arthropoda
Mites and ticks	Spiders	Harvestmen	Pseudoscorpion
Hooded tickspiders	Microwhip scorpion	Shorttailed whipscorpion	Scorpion
Solifuges	Vinegaroons	†Sanctacaris