What does a bedbug look like and what are its dimensions? - briefly
A bedbug is a flattened, oval insect with a reddish‑brown, elongated body and a distinct head‑to‑thorax segmentation. Adults measure about 4–5 mm long and 1.5–3 mm wide.
What does a bedbug look like and what are its dimensions? - in detail
Bedbugs are small, wingless insects belonging to the family Cimicidae. Their bodies are oval, flattened laterally, and resemble a tiny apple seed. The exoskeleton is smooth, with a matte, reddish‑brown coloration that deepens after a blood meal. Six legs emerge from the thorax, each ending in a pair of tiny claws that enable the insect to cling to fabric and upholstery. Antennae consist of four segments and are positioned near the front of the head. The abdomen displays subtle, pale mottling, and the eyes are reduced to simple ocelli, not visible to the naked eye.
Key measurements for an adult specimen are:
- Length: 4.5–5.5 mm (approximately 0.18–0.22 inches) when unfed; up to 7 mm (0.28 inches) after feeding.
- Width: 2.5–3 mm (0.10–0.12 inches) at the widest point of the abdomen.
- Weight: 0.5–1 mg unfed; may increase to 5 mg after a full blood meal.
Nymphal stages resemble adults but are proportionally smaller. First‑instar nymphs measure roughly 1.5 mm in length, while final‑instar nymphs approach adult dimensions but retain a lighter coloration due to reduced blood content.
The insect’s mouthparts form a slender, needle‑like proboscis capable of piercing skin and drawing blood. This structure is concealed within the head capsule when not in use, contributing to the bug’s discreet appearance. Overall, the combination of a flattened, oval body, muted reddish hue, and precise size range distinguishes bedbugs from other household pests.