Chalcid wasps are insects within the superfamily Chalcidoidea, part of the order Hymenoptera. The superfamily contains some 22,500 known species, and an estimated total diversity of more than 500,000 species, meaning the vast majority have yet to be discovered and described. The name "chalcid" is often confused with the name "chalcidid", though the latter refers strictly to one constituent family, the Chalcididae, rather than the superfamily as a whole; accordingly, most recent publications (e.g.,) use the name "chalcidoid" when referring to members of the superfamily.
The Leucospidae are a specialized group of wasps within the superfamily Chalcidoidea, that are ectoparasitoids of aculeate wasps or bees. They are typically mimics of bees or stinging wasps, often black with yellow, red, or white markings, sometimes metallic, with a robust mesosoma and very strong sculpturing. The hind femora are often greatly enlarged, with a row of teeth or serrations along the lower margin as in Chalcididae. The wing has a longitudinal fold. The female ovipositor is sometimes short, but if not, it is recurved and lies along the dorsal side of the metasoma, a unique feature. The males are also unusual, in the fusion of many of the metasomal segments to form a capsule-like "carapace".
Eupelmidae is a family of parasitic wasps in the superfamily Chalcidoidea. The larvae of the majority are primary parasitoids, commonly on beetle larvae, though many other hosts are attacked, including spiders. Details of the life history varies considerably. They are found throughout the world in virtually all habitats.
The Ormyridae are a small family of parasitic wasps in the superfamily Chalcidoidea. They are either parasitoids or hyperparasitoids on gall-forming insects, primarily cynipid wasps and tephritid flies. The 120 or so species are cosmopolitan, except almost entirely absent from South America.
The Tetracampidae are a small family of parasitic wasps in the superfamily Chalcidoidea. They are parasitoids of phytophagous insects, primarily flies. The 44 species in 15 genera are almost entirely absent from the New World.
Signiphoridae is a small family of parasitic wasps in the superfamily Chalcidoidea. The roughly 80 species are placed in four genera.
Trisecodes is a genus of parasitic chalcid wasps of the family Systasidae. The genus was originally placed in Eulophidae, based on a number of morphological features, but molecular evidence suggests that the genus is more closely related to Systasis and Semiotellus. The type species is a parasitoid of a range of Agromyzid leaf-mining flies.
Pteromalinae is a parasitoid wasp subfamily in the family Pteromalidae.
Psyllaephagus is a genus of chalcid wasps. It was named and circumscribed by William Harris Ashmead in 1900. As of 2019, Psyllaephagus contains approximately 245 species. They are found worldwide: Australia has 100 described species; the Palaearctic region has about 57 species, India has about 20, and Africa about 30.
Pteromalus cassotis is a species of parasitic wasp in the family Pteromalidae that parasitizes the chrysalides of monarch butterflies. They are gregarious parasitoids, meaning a single female lays many eggs in a single host. Research into this species has documented that up to 425 adult wasps can emerge from a single chrysalis. The wasps have a heavy female bias, averaging 90% female. Maximum entropy models suggest that the natural habitat of this species encompasses the continental United States, southern Canada and parts of Mexico; areas inhabited by the caterpillars of monarch butterflies, which are the larvae's hosts.
Epichrysomallidae is a family of gall-forming wasps associated with fig trees - they make galls in figs, or on leaves or twigs. Once considered a subfamily of Pteromalidae (Epichrysomallinae), this group of genera has been elevated to family rank; they are now known to be more closely related to other gall-forming chalcid wasps than to pteromalids.
Pelecinellidae is a small family of chalcidoid wasps, formerly treated as the subfamily Leptofoeninae within Pteromalidae. They, like many small chalcidoids, are brilliantly metallic.
Lyciscidae is a family of chalcid wasps. The genera comprising this family were previously placed in the Cleonyminae subfamily of a paraphyletic Pteromalidae.
Spalangiidae is a family of chalcid wasps that are parasitoids of flies. The two subfamilies were moved from the family Pteromalidae to create this family in 2022. They are now known to be more closely related to the planidial clade of chalcid wasps than to the core Pteromalidae.
Ceidae is a small family of chalcid wasps, previously classified as subfamily Ceinae, in the polyphyletic family Pteromalidae. These wasps are parasitoids of other small insects. Hosts are known only for Cea pulicaris and Spalangiopelta alata.
Systasidae is a family of chalcidoid wasps. In 2022, this family was described based on an analysis of a combination of molecular, morphological, and life history data.
Eunotidae is a family of chalcidoid wasps. In 2022, this family was described based on an analysis of a combination of molecular, morphological, and life history data.
Herbertiidae is a family of chalcidoid wasps. In 2022, this family was described based on an analysis of a combination of molecular, morphological, and life history data.
Heydeniidae is a family of chalcidoid wasps. In 2022, this family was described based on an analysis of a combination of molecular, morphological, and life history data.
Calesidae is a small family of chalcid wasps, previously classified as subfamily Calesinae, in the family Aphelinidae. These tiny wasps are parasitoids of other small insects, mainly whitefly species, including the widespread pest Aleurothrixus floccosus.
