Trichilogaster

Trichilogaster is a small genus of chalcid wasps in the family Melanosomellidae, previously they were included in family Pteromalidae subfamily Ormocerinae. With one described exception, they all are Australian species that are gall-formers on Australian species of Acacia. The exception is an Arabian species. Apart from its ecological interest, the genus is of practical importance because some of its members are successful biocontrol agents in South Africa at least, where T. acaciaelongifoliae and T. signiventris have been established successfully to control invasive Australian Acacia species, notably Acacia longifolia and Acacia pycnantha.

==Species== The species most recently recognised in a revision of the genus are: Trichilogaster acaciaelongifoliae (Froggatt, 1892) Trichilogaster arabica Ferrière, 1947 Trichilogaster channingi (Girault, 1913) Trichilogaster esculenta Ferrière, 1947 Trichilogaster flavivena (Girault, 1931) Trichilogaster maideni (Froggatt, 1892) Trichilogaster olgae Prinsloo & Neser, 2007 Trichilogaster pendulae Mayr, 1905 Trichilogaster signiventris (Girault, 1931) Trichilogaster stefani Prinsloo & Neser, 2007