Oak-galls
Guides
Andricus pilularis
Andricus pilularis is a species of cynipid gall wasp in the family Cynipidae. Like other members of its genus, this wasp induces the formation of distinctive galls on oak trees (Quercus spp.). The species exhibits the characteristic life cycle of gall wasps, with larvae developing inside plant tissue structures that provide both food and shelter. Specific details regarding its host associations and gall morphology require further documentation.
Arthrolytus
A genus of small parasitoid wasps in the family Pteromalidae. European species have been reared from cynipid galls on oak, indicating a parasitoid relationship with gall wasps. The genus includes at least two newly described European species, A. nanus and A. incisus, alongside A. ocellus.
Bootanomyia
Bootanomyia is a genus of parasitoid wasps in the family Megastigmidae. Members are small chalcidoid wasps that develop as parasitoids within oak galls induced by cynipid gall wasps. Two European species morphologically keyed to B. dorsalis have been introduced to North America: one clade found in New York, and another in the Pacific Northwest. These introductions represent the first documented cases of Bootanomyia establishment in North America.