One common poisonous species is the black widow spider. Black widows are shy and like dark places. They spin a characteristically messy web. They are shiny black, moderately sized spiders with a reddish or orange hourglass marking on the underside of the abdomen. Males and immature females can have stripes of red, yellow, and black on the abdomen.
Ticks are larger than mites and are important because they are parasites of man and animals.
The most prevalent tick in Arizona is the brown dog tick. It is specific to dogs and can develop infestations in kennels, backyards, and inside homes. This tick is not known to transmit human diseases. Scorpions have two body regions, the cephalothorax and the abdomen. The telson contains the stinger.