Flour Mite

Acarus siro

Appearance

•  Adult - 0.5 mm long. 4 pairs of legs. White or pale brown. Slow moving.
•  Larva - 6 legged and 0.5 mm long. White in colour. Passes through two, 8 legged nymphal stages.

Lifecycle

•  9 - 11 days at 23°C and 90% relative humidity.

Habits

•  Under adverse conditions, may pass through a long and very resistant stage called a hypopus.