👉 Scarabaeiformia is a class of crustaceans that includes the most diverse group of arachnids, including scorpions and spiders. They are characterized by their long, slender bodies with eight legs, which they use for walking and climbing. The scorpion family (Arachnida) belong to this group, while the spider family (Omnichthyes) is a separate class within the order Araneae.