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Unidentified "Oak Apples" and Other Large, Spherical Oak Galls

Cocoon? Cocoon? gall on oak leaf Oak apple gall Large Gall? What is this? gall on northern pin oak Golf Ball Sized Eggsac
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (parasitic Apocrita)
Superfamily Cynipoidea
Family Cynipidae (Gall Wasps)
No Taxon Unidentified "Oak Apples" and Other Large, Spherical Oak Galls
Remarks
Many different cynipid wasps form large, spherical galls on oak leaves, some of which are called "oak apples." As with most galls, ID requires knowing the species of oak. It is also critical to look at the internal structure:

Even then, there are some very similar ones, and it may be necessary to examine the adult wasp that emerges.