Inquilines of the genus Periclistus Förster (Hymenoptera: Cynipidae) have lost the ability to induce their own galls, and are obligatorily dependent on completing their development within galls of Diplolepis. Periclistus induce gall tissues of their own from the tissues of the galls they inhabit ... Feeding by Periclistus causes each [Periclistus] larva to be surrounded within its own chamber, and as a result the inquiline-modified galls are structurally different from normal galls ...

- Y. Miles Zhang et al.: (2019) DNA barcodes reveal inconsistent species boundaries in Diplolepis rose gall wasps and their Periclistus inquilines (Hymenoptera: Cynipidae)^©