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Megarhyssa macrurus, also known as the long-tailed giant ichneumonid wasp [1] or long-tailed giant ichneumon wasp, [2] is a species of large ichneumon wasp. [3] It is a parasitoid, notable for its extremely long ovipositor which it uses to deposit an egg into a tunnel in dead wood bored by its host, the larva of a similarly large species of horntail.
Female Megarhyssa praecellens in China. Megarhyssa, also known as giant ichneumonid wasps, giant ichneumons, or stump stabbers, [1] is a genus of large ichneumon wasps, with some species known for having the longest ovipositors of any insects. They are idiobiont endoparasitoids of the larvae of wood-boring horntail wasps.
Megarhyssa nortoni is a predatory insect. Its larvae are parasitoids of horntail wasp larvae in coniferous trees. The adult female hunts horntail larvae for egg placement. It smells wood-eating fungus, utilized by the horntail larvae to predigest wood pulp, and uses its antennae to detect vibrations made by the horntail larvae.
Most are slender, and the females of many species (particularly in the genus Megarhyssa) have extremely long ovipositors for laying eggs. The ichneumonid wasps may be more familiar to non-entomologists than braconids, as they are generally larger. The two families are distinguished from each other primarily by details of wing venation.
The female giant ichneumon wasp Megarhyssa macrurus is 12.5 centimetres (5 in) long including its very long but slender ovipositor which is used for boring into wood and inserting eggs. [17]
Ichneumoninae is a worldwide subfamily of the parasitic wasp family Ichneumonidae. Ichneumoninae are koinobiont or idiobiont endoparasitoids of Lepidoptera. It is the second largest subfamily of Ichneumonidae, with 373 genera. Ichneumonines are often large, conspicuous colourful insects.
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It is very similar in appearance to Megarhyssa macrurus, but the latter species has a relatively longer ovipositor (about 2x the total body length, where greenei is only slightly greater than 1x), and usually has more extensive dark wing markings. M. greenei also lacks the dark striping on the face present on M. macrurus. [2]