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Species Andricus dimorphus - Clustered Midrib Gall Wasp

oak galls - Andricus dimorphus galls - Andricus dimorphus galls on oak - Andricus dimorphus Adleria dimorpha? - Andricus dimorphus Oak Leaf Gall ID Request - Andricus dimorphus galls - Andricus dimorphus red galls on white oak - Andricus dimorphus Unknown egg mass  - Andricus dimorphus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" (parasitic Apocrita))
Superfamily Cynipoidea
Family Cynipidae (Gall Wasps)
Tribe Cynipini
Genus Andricus
Species dimorphus (Clustered Midrib Gall Wasp)
Synonyms and other taxonomic changes
Cynips dimorphus Beutenm├╝ller, 1913
Adleria dimorpha
Andricus dimorphus
Life Cycle
Weld (1) reports that adults emerged from collected galls in the second, third, and fourth springs, in late March or early April.
Remarks
Forms galls on leaves in the white oak group. "Galls in rounded masses, a few to 30 in each, closely packed, clustered on the under side of the midrib or petiole, one-celled, globose, pointed basally, greenish, tinged with pink when fresh, grayish when old, individual galls, diameter 1/10 to 1/8 inch, diameter of masses from 1/4 to 1/2 inch, on white, burr and chestnut oaks." (2) In addition to these hosts (Quercus alba, Q. macrocarpa, and Q. prinus), Weld (1) lists Q. prinoides (dwarf chinkapin oak), and notes that there is a similar gall on Q. laceyi.
Works Cited
1.Cynipid Galls of the Eastern United States
Lewis H. Weld. 1959. Privately printed in Ann Arbor, Michigan.
2.Plant Galls and Gall Makers
Ephraim Porter Felt. 1940. Comstock Publishing Company, Inc., Ithaca NY.