Ornithonyssus sylviarum

Definition

A haematophagous mesostigmatid mite (Family Macronyssidae) that parasitizes poultry and wild birds. Adults and nymphs feed on host blood, causing anemia, reduced egg production, and feed-conversion losses in commercial laying flocks; heavy infestations can be fatal. Unlike the temporary red mite Dermanyssus gallinae, O. sylviarum completes its entire life cycle on the host, making it a permanent ectoparasite of domestic chickens and a significant pest in intensive poultry systems.

Etymology

New Latin: Ornitho- (bird) + nyssus (from Greek nysso, to prick or pierce); sylviarum (of the woods/forest, referring to original wild-bird hosts).

Example

In cage-free layer operations, Ornithonyssus sylviarum can build dense populations on hens and in nest boxes, requiring integrated control combining acaricide-treated perches and periodic flock rotation.

Synonyms

• Northern fowl mite
• poultry mite

Related Terms

• Dermanyssus gallinae
• Mesostigmata
• Macronyssidae
• haematophagy
• Ectoparasite
• acarology
• poultry entomology

Usage Notes

Often confused with the red mite Dermanyssus gallinae; specialists distinguish them by permanent vs. temporary parasitism and subtle morphological differences in the dorsal shield and chelicerae. The subspecies O. sylviarum utrechtensis has been described but is not universally recognized.