Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

Giant ichneumonid

Megarhyssa nortoni nortoni (Cresson)

Order: Hymenoptera
Family: Ichneumonidae

Size range

  • Body length 15–45 mm. Ovipositor twice as long as body.


  • Introduced from North America in 1962 and 1964.Now established in many forest areas.

Life History

  • One of several parasites of larval wood wasp, Sirex noctilio
  • Long ovipositor to deposit eggs on Sirex grubs deep in timber
  • Adults feed on nectar or honeydew

Additional images