Tropical fowl mite

Definition

A haematophagous mite species, Ornithonyssus bursa (Family Macronyssidae), that parasitizes birds and occasionally bites mammals including humans. Unlike the northern fowl mite (Ornithonyssus sylviarum), it is primarily diurnal, inhabits feathers but deposits eggs in nest material, and completes its life cycle through five stages: egg, larva, protonymph, deutonymph, and adult, with blood-feeding restricted to the two nymphal instars and adult stage.

Etymology

From 'tropical' (referring to its warm-climate distribution), 'fowl' (primary avian hosts), and 'mite' (common name for small arachnids in the subclass Acari).

Example

A poultry farmer in Florida discovers diurnally active mites on cage layers; identification confirms tropical fowl mite rather than northern fowl mite based on the circadian activity pattern and egg-laying behavior in nest litter rather than on feathers.

Synonyms

• Ornithonyssus bursa

Related Terms

• Northern fowl mite
• Ornithonyssus sylviarum
• Macronyssidae
• mesostigmatid mite
• avian mite dermatitis
• Protonymph
• deutonymph
• haematophagy
• Ectoparasite

Usage Notes

Often contrasted with northern fowl mite (Ornithonyssus sylviarum), which is nocturnal and lays eggs on host feathers. The common name 'tropical fowl mite' reflects its prevalence in warmer regions, though its range extends into temperate zones. In human medicine, bites may cause gamasoidosis (avian mite dermatitis), requiring differentiation from scabies or other arthropod bites. Not to be confused with the chicken mite (Dermanyssus gallinae), a related but distinct mesostigmatid pest of poultry.