The Probert Encyclopaedia of Nature

SYMPHYTA

Symphyta is a sub-order of the order Hymenoptera. These are the oldest order of the Hymenoptera, hymenopterous insects whose abdomen is joined to the thorax along its whole width and height. Males and females differ in the shape and colour of the body, the shape of the antennae and in other ways. The wings always have well-developed venation. They are reluctant, heavy, and sometimes noisy fliers. The females have ovipositors of varying length.
Research Symphyta