Rivasia fumariae Askew & Nieves-Aldrey, 2005

Measurements. Body length: 1.5–1.8 (1.7) mm, maximum width: 0.7–0.9 (0.8) mm (n=4) ex gall Neaylax versicolor (Nieves-Aldrey) .

Description. Single row of very short setae visible on thoracic segments (Figs 4 G, 6G); body strongly curved ventrally (Fig. 5 G).

Head (anterior view) (Fig. 6 G). Trapezoid with the vertex strongly incised medially; antennal area bulging and conspicuous.

Mouth parts (Fig. 7 G). Ventral margin of clypeus straight; labrum subrectangular, 4.5× wider than long.

Mandibles (Fig. 8 E). Tooth relatively short and wide and slightly recurved from its base; angle separating inner side of tooth and base of mandible nearly 90º with outer margin relatively convex.

Biology. Askew & Nieves-Aldrey (2005) provided a detailed description of the terminal larva of R. fumariae . The species has been recently described and a new genus was created to include it. The species is strictly associated with galls on fruits of Fumaria spp . ( Papaveraceae) induced by N. versicolor (Fig. 9 G). It is a monophagous primary ectoparasitoid and has so far been recorded in only a few localities in Spain (Askew & Nieves-Aldrey 2005; Askew et al. 2006; Gómez et al. 2006).

Material examined. ex gall N. versicolor on Fumaria sp., Spain, Almería: San José (n=2); Madrid: Rivas- Vaciamadrid (n=1); Tarragona: Marçá (n=1).