Wasp
The largest social wasp is the Asian giant hornet, at up to in length. The various tarantula hawk wasps are of a similar size and can overpower a spider many times its own weight, and move it to its burrow, with a sting that is excruciatingly painful to humans. The solitary giant scoliid, "Megascolia procer", with a wingspan of 11.5 cm, has subspecies in Sumatra and Java; it is a parasitoid of the Atlas beetle "Chalcosoma atlas". The female giant ichneumon wasp "Megarhyssa macrurus" is long including its very long but slender ovipositor which is used for boring into wood and inserting eggs. The smallest wasps are solitary chalcid wasps in the family Mymaridae, including the world's smallest known insect, "Dicopomorpha echmepterygis" (139 micrometres long) and "Kikiki huna" with a body length of only 158 micrometres, the smallest known flying insect.
Cantuaria dendyi
Even though "Cantuaria" seem to be safe living their life underground, there are always predators who will find a way to surpass that obstacle and feed on the spider. The greatest of these enemies appears to be New Zealand's largest black hunting wasp, "Priocnemis monachus". "Cantuaria" are rather large spiders, so it makes sense that a large wasp would seek out a hefty meal for their growing larvae. Species of "Cantuaria" that live in their burrow without a trapdoor are most at risk, but this wasp is known to be strong enough to pull the lid open or bite clean through it, which puts "C. dendyi" at risk. The wasps have also been known to pretend to be an insect at the entrance and when the spider attacks, the wasp immediately grasps it. Some wasps also proceed to take over the spider's burrow, opening and closing the trapdoor as it pleases.