Venom apparatus of braconid wasps: comparative ultrastructure of reservoirs and gland filaments.

Two types of venom apparatus present in female braconid wasp were examined in nine species and compared ultrastructurally. The reservoir of type 1 venom apparatus has a relatively thick muscular sheath which is innervated, while the longitudinal and circular muscles of the type 2 reservoir consist of scattered fibers which are not innervated. The intima of the reservoir of type 1 venom apparatus is unevenly thickened. In contrast, the reservoir of type 2 venom apparatus has a relatively thinner and more uniform intima. The gland filaments of both types of venom apparatus are ultrastructurally similar. Distinct particles found in the venom apparatus of two of the nine species are described.