The Hymenopteran superfamily of parasitoid wasps, Platygastroidea, has often been treated as a lineage within the superfamily Proctotrupoidea, but most classifications since 1977 have recognized it as an independent group within the Proctotrupomorpha. It is presently has some 4000 described species. They are exclusively parasitic in nature.
The hymenopteran family Platygastridae is a large group of exclusively parasitoid wasps, mostly very small (1–2 mm), black, and shining, with geniculate (elbowed) antennae that have an eight-segmented flagellum. The wings sometimes lack venation, though they may have slight fringes of setae.
The hymenopteran family Scelionidae is a very large cosmopolitan group of exclusively parasitoid wasps, mostly small (0.5–10 mm), often black, often highly sculptured, with (typically) elbowed antennae that have a 9- or 10-segmented flagellum. It was once considered to be a subfamily of the Platygastridae, but has been revived in the most recent classification of Platygastroidea.
Platygaster is a genus of parasitoid wasps in the family Platygastridae. There are more than 560 described species in Platygaster.
Calliscelio is a parasitoid wasp genus which contains two species, C. elegans and C. teleogrylli.
Anteris is a genus of wasps in the family Platygastridae. There are about 15 described species in Anteris.
Oethecoctonus is a genus of parasitoid wasps in the family Platygastridae. There are about six described species in Oethecoctonus.
Teleasinae is a subfamily of wasps in the family Platygastridae. There are about 14 genera and more than 250 species in Teleasinae.
Trissolcus is a genus of parasitoid wasps in the family Platygastridae. There are at least 180 described species in Trissolcus. They parasitize eggs of Pentatomorpha.
Metaclisis is a genus of parasitoid wasps in the family Platygastridae. There are at least 30 described species in Metaclisis.
Idris is a genus of parasitic wasps in the family Platygastridae, containing about 160 described species. This genus is part of the tribe Baeini, which are egg parasitoids. Members of the genus Idris are mostly parasitoids of spider eggs, but at least one member of the genus uses stink bugs as hosts.
Sparasion is a genus of wasps belonging to the family Sparasionidae, whitin the superfamily Platygastridae. The genus has specimens widespread in Eurasia, Africa, and temperate North America.
Neuroscelionidae is a family of wasps in the superfamily Platygastroidea. It contains only one extant genus, Neuroscelio, with two other genera known from fossils. Members of Neuroscelio are known from Southeast Asia and Australia. Their hosts are unknown.
Nixonia is a genus of wasps. It is the only member of the family Nixoniidae in the superfamily Platygastroidea. They are amongst the largest of the platygastroids at up to 9 mm in length. Members of the genus are known from Africa, the Indian subcontinent and Southeast Asia. The biology of only one species is known, which parasitises orthopteran eggs.
Geoscelionidae is a family of wasps in the superfamily Platygastroidea. It contains three extant species in two genera, native to South America and Africa, and several other genera known from fossils. It was originally erected as the tribe Geoscelionini within Scelionidae. It was raised to a full family in 2021.
Sparasionidae is a family of wasps in the superfamily Platygastroidea. Known species are parasitioids of the eggs of orthopterans.
