The genus (Diptera, Cecidomyiidae, Asphondyliini, Schizomyiina) was erected by Kovalev (1964) based on the presence of constrictions on the cylindrical male flagellomeres. In the present study, we examine the morphological features of and and found that the male flagellomeres are constricted also in , the type species of . Because no further characters clearly separating from were observed, we synonymize under . Molecular phylogenetic analysis strongly supports our taxonomic treatment. We describe five new species of from Japan, Elsayed & Tokuda, , Elsayed & Tokuda, , Elsayed & Tokuda, , Elsayed & Tokuda, , and Elsayed & Tokuda, , and redescribe three species, Kieffer, Shinji, and Kovalev. A taxonomic key to the Japanese species is provided.
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