[1] The gall is rounded, sometimes elongate, and has a short, thin neck.

Typically, galls are 2–3 millimetres (0.079–0.118 in) in diameter, and may be numerous on the upper surfaces of leaves.

[2] In Britain, the mite affects introduced silver maple.

The species is relatively new to Britain, being first recorded in London in 2002.

This article about a mite or tick is a stub.