Notes on the larval morphology of Pteromalidae (Hymenoptera: Chalcidoidea) species parasitoids of gall wasps (Hymenoptera: Cynipidae) in Europe Author Gómez, Jose F. Author Nieves-Aldrey, Jose Luis text Zootaxa 2012 3189 39 55 journal article 45457 10.5281/zenodo.280035 bdadcf68-8647-455c-997a-efde1b035538 1175-5326 280035 Cecidostiba geganius ( Walker, 1848 ) Measurements. Body length: 1.20–3.04 (2.21) mm, maximum width: 0.48–1.12 (0.82) mm (n=43) ex gall A. quercusradicis (Agamic generation). Description. larger than C. fungosa ; body almost 2.5× as long as broad ( Fig. 4 C) and slightly curved ventrally in lateral view ( Fig. 5 C); ventral margin of body segments convex. Head (anterior view) regularly rounded, almost as broad as long; vertex clearly incised medially ( Fig. 6 C); ventral margin of clypeus straight; labium more or less semicircular, 4× wider than long ( Fig. 7 C). Mouth parts ( Fig. 7 C). Maxillae differentiated from labium; two pairs of maxillary palps visible with two pairs of very short setae; labium semicircular, convex and not collapsed, with a pair of inconspicuous setae. Biology. The species C. geganius is a specific parasitoid of the agamic generation of A. quercusradicis , which induces subterranean galls on roots and stolons of several species of Quercus in Europe ( Fig. 9 F). The larvae of this species are gregarious, many parasitoid larvae being found in a single cell of the multilocular host gall. Material examined. ex gall A. quercusradicis (Agamic generation) on Quercus faginea , Spain , Madrid: Villaviciosa de Odón (El Bosque) (n=43).