Spiders, scorpions, ticks, and mites are all types of which class of animals?

The group that includes spiders, scorpions, ticks, and mites is classified as arachnids. Arachnids are characterized by having eight legs and a body divided into two main segments: the cephalothorax (which combines the head and thorax) and the abdomen. This classification differentiates them from insects, which have six legs and three body segments.

Arachnids are also distinct from crustaceans, which primarily live in aquatic environments and exhibit a considerable diversity in their forms, including having multiple pairs of appendages. Furthermore, myriapods, which include centipedes and millipedes, are characterized by having numerous body segments and many legs, but do not include the animals listed in the question.

Thus, identifying spiders, scorpions, ticks, and mites as arachnids highlights their anatomical and biological similarities that are consistent within this class.