Amphibolips cookii

Amphibolips cookii

Amphibolips cookii is a wasp that forms galls on the buds of red oak (Quercus rubra).
Oak Apple Gall - Amphibolips cookii These green, spherical galls form on the buds of oak (Quercus sp.). This one was 20-25 mm diameter.

I considered that this gall could be Amphibolips quercusinanis, but the galls in that species of wasp form on leaves during late spring. So, A. cookii seemed more likely as they grow on buds and mature in September.

Habitat: Oak tree growing along the coast.
https://www.jungledragon.com/image/72788/oak_apple_gall_-_amphibolips_cookii.html
https://www.jungledragon.com/image/72790/oak_apple_gall_-_amphibolips_cookii.html Amphibolips cookii,Geotagged,Summer,United States,cynipidae,gall,green gall,oak apple gall,oak gall,red oak gall,wasp gall

Appearance

Galls: Spherical, spotted "oak apple" galls, 11-25 mm in diameter, protruding from buds of red oaks.
Oak Apple Gall - Amphibolips cookii These green, spherical galls form on the buds of oak (Quercus sp.). This one was 20-25 mm diameter.

I considered that this gall could be Amphibolips quercusinanis, but the galls in that species of wasp form on leaves during late spring. So, A. cookii seemed more likely as they grow on buds and mature in September.

Habitat: Oak tree growing along the coast.
https://www.jungledragon.com/image/72790/oak_apple_gall_-_amphibolips_cookii.html
https://www.jungledragon.com/image/72789/oak_apple_gall_-_amphibolips_cookii.html Amphibolips,Amphibolips cookii,Geotagged,Summer,United States,gall,oak apple gall,wasp gall

Habitat

Red oak (Quercus rubra) tree buds; They drop in September when full-grown

References:

Some text fragments are auto parsed from Wikipedia.

https://bugguide.net/node/view/579020
Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassInsecta
OrderHymenoptera
FamilyCynipidae
GenusAmphibolips
SpeciesAmphibolips cookii