Diplazontinae

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Hymenopterida
Ordo: Hymenoptera
Subordo: Apocrita
Superfamilia: Ichneumonoidea

Familia: Ichneumonidae
Subfamilia: Diplazontinae
Genera (23): Bioblapsis – Campsocraspedon – Daschia – Diplazon – Ectomocolax – Enizemum – Episemura – Eurytyloides – Extenuosodalis – Fossatyloides – Homotropus – Lithotorus – Peritasis – Phthorima – Promethes – Schachticraspedon – Sussaba – Syrphidepulo – Syrphoctonus – Syrphophilus – Tymmophorus – Woldstedtius – Xestopelta

[source: Taxapad Ichneumonoidea]
Name

Diplazontinae Viereck, 1918

References

Bennett, A.M.R. 2009: The Ichneumonidae (Hymenoptera) of Fiji: keys to subfamilies and genera with a review of the species of Anomaloninae, Banchinae, Brachycyrtinae and Diplazontinae. In: Evenhuis, N.L. & Bickel, D.J. (eds.), Fiji Arthropods XIV. Bishop Museum occasional papers, 105: 3–68. PDF
Diller, E. 1982: Diplazontinae der australischen Region (Hymenoptera, Ichneumonidae, Diplazontinae). Entomofauna, 3(20): 287–321. PDF Reference page.
Klopfstein, S. 2011: A review of the Diplazontinae of Mongolia (Hymenoptera: Ichneumonidae). Zootaxa 2790: 35–53. Preview Reference page.
Klopfstein, S. 2014: Review of the Diplazontinae (Hymenoptera, Ichneumonidae) of the Kuril islands, with descriptions of two new species. Zootaxa 3779(1): 20–32. DOI: 10.11646/zootaxa.3779.1.5 Reference page.
Klopfstein, S. et al. 2011: Molecular and morphological phylogeny of Diplazontinae (Hymenoptera, Ichneumonidae). Zoologica scripta 40(4): 379–402. DOI: 10.1111/j.1463-6409.2011.00481.x Reference page.
Kusigemati, K. 1987: Some Ephialtinae, Banchinae, Porizontinae, Mesochorinae, Metopiinae and Acaenitinae of Formosa (Hymenoptera: Ichneumonidae). Memoirs of the Kagoshima University Research Center for the South Pacific, 8(1): 21–33.
Wahl, D. 1990: A review of the mature larvae of Diplazontinae, with notes on larvae of Acaenitinae and Orthocentrinae and proposal of two new subfamilies (Insecta: Hymenoptera, Ichneumonidae). Journal of natural history 24(1): 27-52. DOI: 10.1080/00222939000770041 Reference page.

Diplazontinae is a subfamily of Ichneumonidae.

They are koinobiont endoparasitoids of Syrphidae. Oviposition is into the egg or larva and emergence is from the puparium. Although they are distributed worldwide most species are in the Holarctic region where there are 19 genera.

Diplazontines have 3-toothed mandibles and the first abdominal tergite is box-like.
Diplazon laetatorius
References

Beirne, B.P., 1941 Beirne, B.P., 1941: British species of Diplazonini with a study of the genital and postgenital abdominal sclerites in the male (Ichneumon.) Transactions of the Royal Entomological Society London 91: 661-712.
Fitton, M.G., and G.E. Rotheray. 1982. A key to the European genera of diplazontine ichneumon‑flies (Ichneumonidae) with notes on the British Fauna. Systematic Entomology 7:311‑320.