What term is used for the primary appendages used for locomotion in arachnids?

The correct term for the primary appendages used for locomotion in arachnids is indeed walking legs. Arachnids, which include spiders, scorpions, and ticks, typically possess eight legs that are primarily adapted for movement. These walking legs are crucial for their ability to navigate various environments, capture prey, and avoid predators.

In contrast, pedipalps are appendages located near the mouth of the arachnids and are often used for sensing the environment, manipulating food, or reproductive purposes rather than for locomotion. Antennae, found in other arthropods like insects, serve sensory functions and are not present in arachnids at all. Chelicerae, on the other hand, are specialized mouthparts used to grasp and process food, playing a significant role in feeding but not in locomotion. This distinction highlights why walking legs are the primary structures associated with movement in these creatures.