Researchers examined galls induced by Rectinasus buxtoni on Pistacia palaestina to determine the real taxonomic position of the gall inducer. They found that the morphological differentiation of gall tissues can be used to determine the taxonomic position. Histological examination of the walls of the galls revealed that Rectinasus should be placed in the same group as Geoica and Baizongia rather than Paracletus and Forda. This study provides evidence for a more accurate understanding of the taxonomic position of genus Rectinasus.