The two compound eyes , composed of more than 2000 lenses, are set on short, movable stalks. The separate sexes are distinguished by the first pair of swimmerets. The males have a stiff, elongated pair of swimmerets that are used to transfer sperm to the body of the female. All the swimmerets of the female are soft and used to carry the fertilized eggs and newly hatched young. Chelicerata contains more than 70,000 species including ticks, mites, spiders, and scorpions.
Arachnids have a body divided into a cephalothorax and abdomen.
Ticks carry some serious diesases and should be regarded with caution. In southern Oklahoma, mites called chiggers will cause humans discomfort. All spiders are poisonous. Most spiders are not aggressive and their bite is no worse than a bee sting. Only two spiders in the U.S. have bites that are normally harmful to humans.