Arachnid Arachnid Arachnids () are a class (Arachnida) of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. Almost all adult 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. The term is derived from the Greek word ("aráchnē"), from the myth of the hubristic human weaver Arachne who was turned into a spider. Spiders are the largest order in the class, which also includes scorpions, ticks, mites, harvestmen, and solifuges. Almost
Arthropods in film higher percentage of oxygen, arthropods would be able to grow quite a bit larger before their trachea became too large and could not grow any more. In fact, in the early years of the earth, when the atmosphere was more oxygen-rich, dragonflies the size of crows were not an uncommon sight. Winsor McCay, one of the founders of animation, made the first animated film about insects in 1912, titled "How a Mosquito Operates". In the early 20th century, it was technically easier to include insects in animated films, which are drawn, over live-action films which would require more advanced techniques