Which characteristic is NOT found in spiders and mites?

The choice indicating that 2 antennae is not a characteristic found in spiders and mites is accurate. Spiders and mites belong to the class Arachnida, which is characterized by having eight legs and lacking antennae. Instead of antennae, arachnids have specialized mouthparts, such as chelicerae and pedipalps, which serve different functions in feeding and sensory perception.

Other characteristics of arachnids include having eight legs and typically being wingless, which align with the definitions provided in the question. They also have two primary body regions: the cephalothorax and the abdomen. Thus, the presence of two antennae is significant because it distinguishes arachnids from other arthropods, such as insects, which do have antennae as part of their anatomy. This clear demarcation helps in identifying and classifying these organisms within the broader category of arthropods.