Zalepidota piperis Rubs. (Diptera Cecidomyiidae) is a stem-gall former on Piper arboreum Aub. (Piperaceae) which occurs during spring in Rio de Janeiro Atlantic Forest. Eight inquilin species and four parasitoid species were also obtained from this gall. Dolichophaonia gallicola (Albuq.) (Diptera: Muscidae) larvae were frequently found inside the gall as inquilin species. The uncommon cecidogenous habit of this muscid species on Pteridium aquilinum Kunth (Pteridophyta), as recorded in the literature, is discussed.
Gall; Insecta; Zalepidota piperis; Atlantic Forest
