This mite was found on an environmental tapelift from a school in Edmonds, Washington. The short birefringent
setae and the birefringent egg are easily visible. One of the supracoxal setae is in focus.
Transmitted Off Crossed Circular Polarized Light
Significance in the Environment:
Birefringent setae are characteristics of the Trombidiformes and the Sarcoptiformes. The setae of Parasitiformes and Holothyroidea are
optically inactive. The optical activity was attributed to actinochitin by F. Grandjean (see Hughes p.6).
Hughes, A.M., THE MITES OF STORED FOOD, Ministry of Agriculture, Fisheries, and Food, Technical Bulletin No. 9, 1961.