Mymarommatidae
The Mymarommatidae, sometimes referred to as False fairy wasps. are a very small family of microscopic parasitic wasps. Only about half of the known species are living taxa (the others are fossils), but they are known from all parts of the world. Undoubtedly, many more await discovery, as they are easily overlooked and difficult to study due to their extremely small size (most have an overall length of around 0.3 mm). Virtually nothing is known about the biology of these insects, but because of their size, and simple ovipositors, entomologists assume they are idiobiont parasitoids on the eggs of  various insects. Psocoptera had been suggested as likely hosts based on circumstantial evidence, and this was confirmed in 2022. They were originally treated as an aberrant subfamily of the chalcidoid family Mymaridae (fairyflies), but because of morphological differences, are now usually placed in their own superfamily, Mymarommatoidea with a number of extinct families, and their similarity to Mymaridae is thought to be a result of parallel evolution. Mymarommatids are distinguished by the presence of a pleated (folded) membrane connecting the front and back halves of the head extending from the mandible to the top of the head, which is presumably  expanded by muscle or hydrostatic pressure, likely to aid in breaking open the walls of the egg capsule. They also possess a two-segmented metasomal petiole, otherwise unknown in Hymenoptera other than ants. Specimens are often found in leaf litter and are rare, but occasionally appear in significant numbers. Classification. As taxonomists have examined this group more closely, they have become less certain about which other group of wasps represents the nearest living relatives of the Mymarommatidae. In recent years, it has been proposed that the nearest relatives of Mymarommatoidea are the extinct Serphitoidea, including the family Serphitidae, and therefore  claim the Mymarommatidae are essentially "living fossils". "Palaeomymar" is known from a single species ("P. succini" Meunier) from Eocene aged Baltic amber, while "Archaeromma" is known from 10 species spread across Laurasia during the Cretaceous dating from the Albian to the Campanian. "Mymaromma" has 11 described extant species. "Mymaromella" has 6 described extant species. Another species of "Mymaromella, M. duerrenfeldi" is known from Miocene amber in Sicily. "Zealaromma" has two extant species: "Z. insulare" and "Z. valentinei." Both species are known from New Zealand.