Ovipositor

In the ichneumon wasp genus Megarhyssa, the females have a slender ovipositor (terebra) several inches long that is used to drill into the wood of tree trunks.

[2] The stingers of the Aculeata (wasps, hornets, bees, and ants) are ovipositors, highly modified and with associated venom glands.

In some cases, the injection also introduces virus particles that suppress the host's immune system and prevent it from destroying the eggs.

An exception is the family Chrysididae, members of the Hymenoptera, in which species such as Chrysis ignita have reduced stinging apparatus and a functional ovipositor.

Seahorses have an ovipositor for introducing eggs into the brood pouch of the male, who carries them until it is time to release the fry into a suitable situation in the open water.

Ovipositor of long-horned grasshopper (the two cerci are also visible)
The process of oviposition in Dolichomitus imperator
  1. Tapping with her antennae, the wasp listens for the vibrations that indicate a host is present
  2. With the longer ovipositor, the wasp drills a hole through the bark
  3. The wasp inserts the ovipositor into the cavity which contains the host larva
  4. Making corrections
  5. Depositing the eggs