The Eulophidae is a large family of hymenopteraninsects, with over 4,300 described species in some 300 genera. The family includes the genus Elasmus, which used to be treated as a separate family, "Elasmidae", and is now treated as a subfamily of Eulophidae. These minute insects are challenging to study, as they deteriorate rapidly after death unless extreme care is taken (e.g., preservation in ethanol), making identification of most museum specimens difficult. The larvae of very few species feed on plants, but the majority are primary parasitoids on a huge range of arthropods at all stages of development. They are exceptional in that they are one of two hymenopteran families with some species that are known to parasitize thrips. Eulophids are found throughout the world in virtually all habitats (one is even aquatic, parasitising water-penny beetles).
Eulophids are separable from most other Chalcidoidea by the possession of only four tarsomeres on each leg, a small, straight protibial spur (as opposed to the larger, curved one in most other chalcidoids), and by antennae with two to four funicle segments and at most 10 antennomeres.
Agmostigma is a small genus of hymenopteran insects of the family Eulophidae which contains three species, all described in 1996 by Ubaidillah and LaSalle and so far only recorded from Brunei in northern Borneo.
Aprostoporoides is a small Indomalayan genus of hymenopteran insects of the family Eulophidae which was described in 2004 with two newly described species from Kerala.
Baeoentedon is a genus of hymenopteran insects of the family Eulophidae, they are parasitoids of whitefly from the family Aleyrodidae which are found on trees of the genus Ficus. They have been recorded from Australia, China, India, Indonesia and Florida. A fifth species, Baeoentodon farazi, was described from Karnataka, India, in 2017.
Colpoclypeus is a genus of hymenopteran insects of the family Eulophidae.
Emersonella is a genus of hymenopteran insects of the family Eulophidae. Several species are known to be phoretic parasitoids of female tortoise beetles, laying their eggs in the eggs of the beetle host.
Goetheana is a genus of hymenopteran insects of the family Eulophidae.
Horismenus is a genus of hymenopteran insects of the family Eulophidae occurring primarily in the Americas. As of 2015 over 400 species in the genus have been described. Horismenus species are often described as parasitizing other insects.
Hyssopus is a genus of hymenopteran insects of the family Eulophidae.
Kokandia is a monotypic genus of hymenopteran insects of the family Eulophidae. The only known species Kokandia salsolicola is a parasitoid of gall midges belonging to the family Cecidomyiidae which use plants of the goosefoot genus Salsola as hosts.
Mischotetrastichus is a genus of hymenopteran insects of the family Eulophidae.
Omphale is a genus of hymenopteran insects of the family Eulophidae.
Parachrysocharis is a genus of hymenopteran insects of the family Eulophidae.
Pediobius is a genus of hymenopteran insects of the chalcid wasp family Eulophidae. Like their relatives, the larvae of these diminutive wasps are parasitoids of various arthropods. Some Pediobius are used in biological pest control.
Pediobomyia is a genus of hymenopteran insects of the family Eulophidae.
Pnigalio is a genus of hymenopteran insects of the family Eulophidae. Nearly 100 species have been described of which about half may be valid. All species are parasites of other insects. Their biology varies widely among those species that have been studied. Some are ectoparasites, others parasitoid, and still others are hyperparasitoids and their hosts include beetles, flies, hymenopteran and lepidopterans.
Quadrastichus is a genus of hymenopteran insects of the family Eulophidae.
Sphenolepis is a genus of hymenopteran insects of the family Eulophidae.
Tetrastichus is a genus of hymenopteran insects of the family Eulophidae.
Thripastichus is a genus of hymenopteran insects of the family Eulophidae.
Trichospilus is a genus of hymenopteran insects of the family Eulophidae.
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