We collected Diplolepis spp. galls on Rosa canina L. between April and September in 2007, 2008 and 2009 in the Inner Western Anatolian. In this study, only inquilines Periclistus brandtii were reared from Diplolepis mayri (Schlechtendal), 1877 galls on laboratory conditions. Periclistus brandtii is a new record for Turkey fauna at genus and species levels. The characteristic features are briefly described; data on distribution and ecological notes are also given. We also discuss effects of Periclistus brandtii on Diplolepis galls and Rosa canina.