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In Europe this wasp has been recorded emerging from galls from Diplolepis eglanteriae, D. mayri and D. spinosissimae. The first published account of it from D. rosae gall was given by Graham(1994) who stated that he had reared 1 male and 5 females from bedeguars on a Rosa agrestis in La Crau, Bouches du Rhone. The second being 1 female in 1970 from a gall on the Causse Mejean, near Florac (Askew 2003)
This was new to Britain in 1997 when one was found in a smooth pea gall Diplolepis nervosa. This was confirmed in 2003 by Jennings who bred more specimens from smooth pea galls. Although not recorded in D. rosae in Britain, it has been recorded from two Bedeguar galls in Southern France in 1996.
The female measures 0.9-1.9mm averaging 1.6mm. The body is black, sometimes with yellow on the side of the thorax and face. The antennae are dark and brassy, with 3 funicular segments. The legs are black banded yellow. The gaster is longer than the head and thorax. The post marginal vein is short.
The male measures 1-1.5mm averaging 1.2mm. The body is black with yellow on the side and back of the thorax and on the face, with dark brassy antennae, which have 4 funicular segments. The coxae are dark with the rest of the legs mainly yellow.
More detailed descriptions and identification keys are available from Robin Williams at the British Plant Gall Society.
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