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A generally yellow to orange species, often with darker colouring later in the year. In extreme cases, the upper part of the abdomen may become entirely dark brown. The wing membranes are colourless, but the spinule distribution varies greatly. The female genital segment is relatively smooth in outline. Antennae are dark in all except the first three segments.
Common and widespread on oak across the UK, in which the nymphs form small galls in July-Spetember, resting in shallow pits on the leaf undersides. Adults overwinter on conifers.
Adult: All year
Length 3-4 mm
|Adult female: Huddersfield, Yorks. (December 2008) ©Joe
|Adult: south London (November 2007) ©Joe
||Adult male: Huddersfield, Yorks. (December 2008) ©Joe
|Galls on Oak: (June 2008) ©Jerry Clough
||Nymph, exuvium: Lincolnshire (October 2007) ©Rachel Scopes