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Synonyms of this wasp include; C. hilaris(Walker 1836) and C. leucopeza (Ratzburg 1844).
Cecidostiba fungosa is a parasitoid of the family Pteromalidae. As such it parasitises many members of the gall forming family of Cynapidae such as; Andricus corruptrix agamic, A. grossulariae sexual and agamic, A. kollari agamic, A. quercuscalicis agamic, A. quercusramuli sexual, Aphelonyx cerricola agamic, and Biorhiza pallida sexual galls. The flight times of this wasp are from march to april then from february through to december.
The female measures from 1.7-3.3mm with an average of 2.6mm head and body.
The head is metallic bright green with a reticulated sculpture and black hairs with the clypeus notched. The eyes are large and red brown in colour and the ocelli are translucent pale brown. The antennae are brassy with 2 rings and 6 funicular segments which darken at the joints. The scape is long and translucent gold and pedicel is darker and flask shaped. The flagellum are slightly tapered with an enlarged club, conspicuous sensillae and pale hairs.
The thorax is bright metallic green with a reticulated mesoscutum with black hairs. There are no notaulices and the reticulated scutellum has 2 longitudinal rows of black hairs. The tegulae are neutral brown and lead to the wings which are clear with neutral brown long hairs and veins. The stigmal vein is long as is the post marginal vein. The stigma is as wide as it is long with a small uncus. The legs have coarsely reticulate metallic green coxae with contrasting yellow trochanter and trochantellus, a dark brown femora and the rest being pale yellow, except for the claws at the bottom of the 5 tarsel segments.
The gaster (abdomen) is segmented, the first segments is glossy metallic bronze green without sculpture, whereas the rest is dark bronze with light sculpture. The gaster is sessile and its shape is long and triangular from the side. The ovipositor sheaths are not visable.
The male measures 1.3-2.5mm averaging out at 1.9mm
The head is metallic bright green with a reticulated sculpture and black hairs with the clypeus notched. The eyes are large and brown in colour and the ocelli are translucent golden brown. The antennae are brassy with 2 rings and 6 funicular segments which darken at the joints. The scape is long and translucent gold and pedicel is darker and flask shaped. The flagellum are slightly tapered with an enlarged club, conspicuous sensillae and pale hairs.
The thorax is bright metallic green with a reticulated mesoscutum with black hairs. There are no notaulices and the reticulated scutellum has 2 longitudinal rows of black hairs. The tegulae are neutral brown and lead to the wings which are clear with neutral brown long hairs and veins. The stigmal vein is long as is the post marginal vein. The stigma is as wide as it is long with a small uncus. The legs have coarsely reticulate metallic green coxae with contrasting yellow trochanter and trochantellus, a dark brown femora and the rest being pale yellow, except for the claws at the bottom of the 5 tarsel segments.
The gaster (abdomen) is segmented, the first segments is glossy dark green without sculpture, whereas the rest is dark brown with sparse hairs. The gaster is sessile and its shape is mid width and shallow.
More detailed descriptions and identification keys are available from Robin Williams at the British Plant Gall Society.
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