Human Louse (specifically likely a Body Louse or Head Louse)
Scientific Name: Pediculus humanus (often split into P. humanus humanus for body lice and P. humanus capitis for head lice)
Order & Family: Order: Phthiraptera; Family: Pediculidae
Size: Typically 2–3 millimeters long (about the size of a sesame seed).
Natural Habitat
Head lice live exclusively on the human scalp and hair. Body lice live in clothing and bedding, moving to the skin only to feed.
Diet & Feeding
Hematophagous (feeds exclusively on human blood several times a day).
Behavior Patterns
They are flightless parasites that crawl; they do not jump or fly. They cling tightly to hair shafts or clothing fibers using claw-like legs. Their life cycle includes eggs (nits), nymphs, and adults. They are transmitted primarily through direct contact.
Risks & Benefits
Risks: Causes intense itching (pruritus), skin irritation, and potential secondary bacterial infections from scratching. Body lice specifically are vectors for diseases like typhus, trench fever, and relapsing fever (head lice do not transmit diseases). Benefits: None known.
Identified on: 2/20/2026