| Summary: | Clinodiplosis quartelensis sp. nov. (holotype male in MNRJ: Brazil, Minas Gerais State), a new gall midge species causing leaf galls on Banisteriopsis membranifolia (A. Juss.) B. Gates (Malpighiaceae), an endemic liana in Brazil, is described based on larva, pupa, adult male and female and its gall is characterized. Galls were collected in Quartel de São João, state of Minas Gerais, Southeastern Brazil. Larvae were removed from the galls and pupae and adults were obtained by rearing. Pupation takes place in the gall. The most important morphological characters were illustrated. The new species is compared with other Neotropical species of Clinodiplosis and belongs to the group with simple tarsal claws, curved beyond tarsus midlength. Clinodiplosis quartelensis sp. nov. shares the male cercus secondarily lobed, the 12th female flagellomere with setulose apical process, the deeply bilobed male hypoproct with convergent lobes, pupa lacking dorsal spines on abdominal segments, and larva with four pairs of setose terminal papillae with C. bellum from that might be distinguished by size of palpus, wing venation, level of sclerotization of eighth abdominal segment in the adults, as well as, by the pupal cephalic dorsal plate and larval spatula.
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