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.
Megachile rotundata
Chalcid wasps are the primary parasites of "M. rotundata." Some species include "Pteromalus venustus", "Monodontomerus obscurus", "Melittobia chalybii", "Diachys confusus", and "Sapyga pumila". The most formidable predator of this species is "P. venustus", a parasitoid wasp in which the female will use its ovipositor to sting a developing "M. rotundata" larva or pupa. After stinging to paralyze its host, the female lays her eggs on the host's surface and the development of the parasite offspring takes place. After about 15–20 weeks, adult "P. venustus" emerge.