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.
Parischnogaster jacobsoni
The nests of "P. jacobsoni" generally reach their maximum size at 48 cells, and can house up to 6 females and 6 males, as well as a total of 33 larvae in a brood. "P. jacobsoni" wasps always use plant matter to construct their nests. They are composed of one or two linear rows anchored on a slim support or scattered across a flat surface. According to the theory that conserving material by utilizing wall-sharing cells and constructing structures to protect the nest are evidence of evolved wasp characters, "P. jacobsoni" constructs nests that are perhaps the most primitive of all wasp nests. It has almost no wall-sharing whatsoever, with cells scattered across the underside of a leaf. The nest, similar to that of "P. nigricans serrei", differs particularly because the alveolar walls are adjoined to the neighboring cells and because pupal cells, instead of being sealed, are simply narrowed.