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Triozidae species have the three main veins in the forewing arising from a common point, and have usually pointed forewings with radular spinules. Many cannot be separated without dissection, but host-plants can be useful.
Trioza galii can be difficult to separate from some other species, and should be confirmed by examination of male parameres; the female terminalia are very short. The colouring of mature specimens is dominantly shiny black, with only antennal segment III pale. The legs are pale exceot for the femora. The forewings can be slightly opaque, yellowish or clear, with a near-straight inner margin; the outer vein is short and non-sinuous. Some have shorter and more rounded wings than others (both forms illustrated here).
A scarce but widespread species feeding on a range of Galium species in various habitats. The nymphs form pit galls. Adults overwinter on evergreens or in leaf litter, at least in continental Europe.
Adult: March-August, perhaps overwintering.
Length ~2.5 mm
|Adult male: North Wales (May 2012) ©Joe Botting|
|Adult female: North Wales (May 2012) ©Joe Botting||Adult male: North Wales (May 2012) ©Joe Botting|
|Adult female: Mid Wales (September 2008) ©Joe Botting||Adult female: Dorset (July 2011) ©Mark Dunkling|