Camel spiders are related to the other arthropods, but several hundred million years ago a divergence occurred between the two lines. They really are different; for example, the breathing system of camel spiders is similar to that observed in insects.[2].
This breathing system is with trachea, which allows for a relatively fast oxygen uptake when necessary, and hence the ability to move fast.
When stretched out, camel spiders can reach a length of five inches, although the average size is somewhere between one-half inch to three inches. Their abdomens have 11 segments, and there is no intermediary segment separating the head from the abdomen. They have two clearly visible eyes and five so called “racket organs.” These organs are probably rudimentary eyes, as scorpions have five very small eyes.
Camel spiders are covered with hairs and spines that allow them to move quickly and sense vibrations in their surroundings