Ornithonyssus bursa

zenz53.jpg (3941 bytes) Female.
zenz50.jpg (4470 bytes) Anal shield.
The anus is in the anterior half of the anal shield.
zenz51.jpg (4144 bytes) Sternal shield
It is differentiated from Ornithonyssus sylviarum by having three pairs of setae on the sternal shield.
zenz52.jpg (4931 bytes) Chelicerae.
In the genus Ornithonyssus the chelicerae are much stouter than thouse of Dermanyssus and the chelae are easily visible under ordinary magnification.