Bed bug
Cimex lectularius
Cimicidae (Bed Bugs), Order Hemiptera
Physical Description
Oval, flat, wingless bodies with a brownish to reddish-brown coloration. They are often compared to an apple seed in shape and size when fully grown, possessing short antennae and a segmented thorax.
Size Estimate
Adults typically measure between 4 to 5 millimeters in length, roughly the size of an apple seed.
Coloration & Markings
Mahogany to reddish-brown, often appearing brighter red after a blood meal due to engorgement.
Web Type
None. This insect does not build webs as it is a parasitic true bug rather than a spider.
Eye Arrangement
Two small compound eyes located on the sides of the head.
Leg Characteristics
Six short, thin legs adapted for crawling rapidly across fabric, wood, and skin; lacks jumping legs.
Venom & Safety Information
Venom Information
Non-venomous. They do not inject venom, but their saliva contains anticoagulants and anesthetics that prevent the host from feeling the bite immediately.
Medical Significance
Harmless in terms of disease transmission, but bites can cause localized skin irritation, itching, allergic reactions, and significant psychological distress.
Safety Recommendations
Inspect second-hand furniture, wash bedding at high temperatures, utilize mattress encasements, and consult professional pest control for severe infestations.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution worldwide; found primarily in human dwellings, specifically in cracks and crevices of mattresses, bed frames, box springs, and surrounding furniture.
Behavior & Temperament
Nocturnal and highly secretive, emerging primarily at night to feed on a host while remaining hidden during daylight hours in tight crevices.
Diet & Prey
Obligate hematophage (blood-feeder); relies exclusively on the blood of humans and other warm-blooded mammals.
Seasonal Activity
Active year-round indoors due to climate-controlled environments provided by human dwellings.
Description
Although frequently mistaken for a spider or tick due to its small, dark, and flat appearance, this is actually a parasitic insect known for infesting sleeping areas and feeding exclusively on blood.
Key Features
Flat oval body, reddish-brown color, wingless form, and association with sleeping surfaces and bite marks.
Similar Species
Booklice, carpet beetles, spider beetles, and bat bugs, which require microscopic examination of setae and hair structures to definitively distinguish.
Life Cycle
Incomplete metamorphosis involving eggs, five nymphal instars requiring a blood meal for each molt, and adults. Females can lay hundreds of eggs over a lifetime.
Ecological Importance
Human commensal parasite functioning solely as an ectoparasite within anthropogenic habitats.
Conservation Status
Abundant and thriving globally alongside human populations; not a species of conservation concern.
Interesting Facts
Bed bugs can survive for several months without a blood meal under cool conditions and can detect exhaled carbon dioxide to locate sleeping hosts.
Photography Tips
Use macro lenses with bright, diffused lighting to capture close-up details of the segmented abdomen, head, and legs for proper identification.
Identified: 2026-08-08T22:09:52.849097