Linen Head Louse (Nit)
Scientific Name: Pediculus humanus capitis
Order & Family: Order: Psocodea, Family: Pediculidae
Size: 0.5 mm to 3 mm (nits are approximately 0.8 mm)
Natural Habitat
Found exclusively on the human scalp and hair, often transferred to bedding or clothing.
Diet & Feeding
Obligate ectoparasite; feeds on human blood multiple times a day.
Behavior Patterns
Glues eggs (nits) to hair shafts or fibers; cannot jump or fly, crawls to move between hosts.
Risks & Benefits
Causes itching, scalp irritation, and secondary infections from scratching; no known ecosystem benefits.
Identified on: 1/13/2026