Host seed size and adult size, emergence, and morphology of Megastigmus aculeatus nigroflavus (Hymenoptera: Torymidae).
The effects of within-plant variation in seed size of Rosa multiflora on adult size, emergence and morphology of the seed-feeding torymid Megastigmus aculeatus var. nigroflavus were investigated, using seeds collected from a single plant in North Carolina during January 1989. Large seeds were proportionally the most heavily infested and seed size significantly affected the body size of emerged adults. Success in emerging from the seed was not influenced by seed size. The static intraspecific allometry of the wasps was determined. Three of 9 measured characters (length of scape, length of pedicel and ocellocular distance) had a negative allometric relationship when log-transformed and plotted against thorax length; the remaining measurements were isometric.