Female Trichilogaster signiventris, photographed by John Hoffman.

Belongs within: Ormocerinae.

Trichilogaster is a genus of wasps forming galls on Acacia species (Bouček 1988).

Characters (from Bouček 1988): Body robust, often partly rufous or yellowish brown, with thorax short and convex, sometimes broader than head, always sculptured, sometimes rather coarsely. Head with broadly concave occiput and convex frons; scrobes not large but sometimes reaching ocellus. Clypeus produced, bilobate. Antennae at centre of face or slightly above, formula 11263; anelli large, flagellum in female subfiliform. clava symmetric. Pronotum nearly as broad as scutum, medially short; notauli narrow but deep; axillae slightly advanced, medially almost meeting. Scutellum slightly oblong, with admarginai groove, apex closely applied to raised middle of dorsellum (in side view). Propodeum often with longitudinal rugae or at least with weak median carina and curved plicae posteriorly. Hind tibia with 2 spurs. Forewing with veins rather short, the marginal and base of postmarginal slightly thickened, stigma often knobbed; often infumation present below parastigma. Gaster short and high but collapsing rather irregularly; hind margins of tergites 1 and 2 emarginate, exposing large third tergite, this often with coarse sculpture.

<==Trichilogaster Mayr 1906 [incl. Epiperilampus Girault 1913] B88
    |--*T. maideni (Froggatt 1892) [=Cynips maideni] B88
    |--T. acaciaelongifoliae (Froggatt 1892) [=Cynips acaciaelongifoliae, T. longifoliae Mayr 1905] B88
    |--T. arabica B88
    |--T. atra (Girault 1915) [=Epiperilampus ater] B88
    |--T. atricorpus (Girault 1931) [=Epiperilampus atricorpus; incl. E. atricorpus socratis Girault 1931] B88
    |--T. channingi (Girault 1913) [=Epiperilampus channingi] B88
    |--T. esculenta Ferrière in Gahan & Ferrière 1947 [=T. esculentus] B88
    |--T. flavivena (Girault 1931) [=Coelocybelloides flavivena] B88
    |--T. pendulae Mayr 1905 B88
    |--T. significata (Girault 1913) [=Epiperilampus significatus] B88
    |--T. signiventris (Girault 1931) (see below for synonymy) B88
    `--T. xanthocephala (Girault 1913) [=*Epiperilampus xanthocephalus] B88

Trichilogaster signiventris (Girault 1931) [=Perilampella signiventris; incl. Epiperilampus adolphi Girault 1931, Trichilogaster adolphi, Coelocybelloides atraticorpus Girault 1931] B88

*Type species of generic name indicated


[B88] Bouček, Z. 1988. Australasian Chalcidoidea (Hymenoptera): A biosystematic revision of genera of fourteen families, with a reclassification of species. CAB International: Wallingford (UK).

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