The blood vascular system includes a hemocoel and the coelom is reduced. Excretion is accomplished by coxal glands and Malpighian tubules. Respiration is via book lungs and the respiratory pigment hemocyanin is present in solution in the blood. There is a variety of sense organs. Poison from glands in the telson is injected into the prey.
Scorpions are gonochoristic with complex mating behavior resulting in transfer of spermatophores.
Fertilization is internal without copulation. Scorpions are viviparous and the female may care for the juveniles after birth. This exercise is written for the Carolina scorpion, Vaejovis carolinianus , which is one of the species supplied commercially. Scorpions are usually studied using preserved material and any species can be used. Because of the small size of most scorpions the exercise is limited to the external anatomy.