Arthropod assaults on humans may have many manifestations clinically, histologically, and immunologically. The Hymenoptera is a large order of about 100,000 species of insects that includes bees, wasps, and ants. Insects in this group can be recognized by the narrow isthmus, which connects their abdomen to their thorax. All Cimex organisms are red-brown colored insects. Cimex lectularius are 5-7 mm in size.
Females are slightly larger than males.
Females deposit fertilized eggs in cracks or crevices, with newborns emerging in 4-5 days. The mechanism of skin injury by arthropods depends on the structure of the mouthparts. Some patients show a severe systemic hypersensitivity to arthropod allergens. Bedbugs are 5-7 mm in length with reduced wings. The mouthparts are modified for piercing and sucking.