Symphyta (sawflies, woodwasps; subclass Pterygota, order Hymenoptera)
The smaller suborder of the Hymenoptera, whose members are distinguished from the Apocrita
by the lack of a constriction at the base of the abdomen. The ovipositor
is large and used for piercing and sawing plant tissues. Adults have a fore wing with one–three marginal cells and a hind wing with three basal cells. In adult saw-flies, the trochanters
are two-segmented. The larvae resemble the caterpillars of the Lepidoptera
, but differ in having up to seven pairs of abdominal prolegs
. The larvae are mostly herbivorous, except for members of the parasitic family Orussidae
. Symphytans occur on flowers and in association with their host plants, some causing defoliation.
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