Seven new Rhopalomyia gall midges (Diptera: Cecidomyiidae) from Australia broaden the scope of the genus

Seven new species of Rhopalomyia Rübsaamen, 1892 are described from eastern Australia feeding on a diverse range of plant genera and families. All induce galls on flower or growth buds: Rhopalomyia cassiniae Adair & Kolesik, sp. nov. on Cassinia subtropica (Asteraceae), R hopalomyia digitata Adair & Kolesik, sp. nov. on Podolobium ilicifolium (Fabaceae), Rhopalomyia glebosa Adair & Kolesik, sp. nov. on Parsonsia straminea (Apocynaceae), R hopalomyia inconspicua Adair & Kolesik, sp. nov. on Kunzea sp. (Myrtaceae), Rhopalomyia ozothamniae Adair & Kolesik, sp. nov. on Ozothamnus ferrugineus (Asteraceae), Rhopalomyia pultenicola Adair & Kolesik, sp. nov. on Pultenaea forsythiana (Fabaceae) and Rhopalomyia stypheliae Adair & Kolesik, sp. nov. on Syphelia triflora (Ericaceae). The scope of Rhopalomyia is broadened to contain species with a partially setulose gonostyle and a four‐segmented palp, a decision supported by a phylogenetic analysis based on the barcoding section of the mitochondrial COI gene. Apocynaceae, Ericaceae, Fabaceae and Myrtaceae are recorded as hosts of Rhopalomyia for the first time.