Wasp
Wasps first appeared in the fossil record in the Jurassic, and diversified into many surviving superfamilies by the Cretaceous. They are a successful and diverse group of insects with tens of thousands of described species; wasps have spread to all parts of the world except for the polar regions. The largest social wasp is the Asian giant hornet, at up to in length; among the largest solitary wasps is a group of species known as tarantula hawks, along with the giant scoliid of Indonesia ("Megascolia procer"). The smallest wasps are solitary chalcid wasps in the family Mymaridae, including the world's smallest known insect, with a body length of only , and the smallest known flying insect, only long.
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.