Galendromus occidentalis - Description

Galendromus occidentalis, commonly known as the western predatory mite, is a member of the family Phytoseiidae (Order Acari). Adults are pear-shaped and approximately 1/70 inch (0.36 mm) in length. Nymphs resemble small adults but are more oval in shape. Adults and nymphs are translucent to white, or take on the coloration of their prey.

A key distinguishing trait of this species is its environmental tolerance. The western predatory mite tolerates hot temperatures and low relative humidity, functioning across a relative humidity range of 40 to 80%. It can remain active year-round in mild climates, and in colder regions it overwinters as mated females in bark crevices and ground litter. This adaptability makes it especially well-suited for warm, arid growing environments where other predatory mite species may struggle.