Eretmocerus is a genus of parasitoid wasps; they parasitise immature whiteflies.

Diagnosis Female with 5-segmented antennae with scape, pedicel, two funicular segments and club (club undifferentiated, often large and oar-shaped); male with 3-segmented antennae composed of scape, pedicel and club (club undifferentiated, elongate and exceptionally large). Forewing with stigmal vein very short; all tarsi with four segments.

Species About 84 species have been described.UCD Community. 2023. Universal Chalcidoidea Database Website. https://ucd.chalcid.org. Accessed on 11 July, 2024.

Species with known whitefly hosts include: Eretmocerus antennator Eretmocerus breviclavus Eretmocerus californicus Eretmocerus comperei Eretmocerus corni Eretmocerus debachi Eretmocerus delhiensis Eretmocerus diversiciliatus Eretmocerus eremicus Eretmocerus flavus Eretmocerus furuhashii Eretmocerus gracilis Eretmocerus gunturiensis Eretmocerus haldemani Eretmocerus hayati Eretmocerus jimenezi Eretmocerus joeballi Eretmocerus longiscapus Eretmocerus mundus Eretmocerus neobemisiae Eretmocerus orientalis Eretmocerus paulistus Eretmocerus portoricensis Eretmocerus queenslandensis Eretmocerus roseni Eretmocerus rui Eretmocerus serius Eretmocerus staufferi Eretmocerus tejanus Eretmocerus trialeurodis

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