Arachnids include spiders, scorpions, mites and ticks. There are about 60,000 species of arachnids. Arachnids have eight legs, not six like insects. They also have an extra pair of either pincers or fangs. They do not have wings or antennae but they do have a hard exoskeleton.Arachnids have two parts to their body-the cephalothorax and the abdomen. The cephalothorax is like the head and thorax section of an insect but it is fused together.rachnids include spiders, scorpions, mites and ticks. There are about 60,000 species of arachnids. Arachnids have eight legs, not six like insects. They also have an extra pair of either pincers or fangs. They do not have wings or antennae but they do have a hard exoskeleton.