Northern Naturalists - Invertebrate Tracking Field Guide

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Tracks & Sign of Insects and Other Invertebrates
Field Guide updates, additions, corrections. Ongoing...
( taxa covered )

1. Eggs and Egg Cases
2. Pupae and Exuviae
3. Parasitism, Predation, and Other Causes of Death
4. Sign on Vertebrates
5. Droppings, Secretions, and Protective Coverings without Foreign Materials
6. Webs and Other Silken Constructions
7. Cocoons
8. Coverings, Cases, Retreats, and Nests Made from Foreign Materials
9. Sign on Algae, Fungi, and Plants

10. Leaf Mines
11. Leaf Shelters
12. Galls
13. Sign on Twigs, Stems, and Stemlike Structures
14. Sign on and in Wood
15. Sign on Rocks and Shells
16. Burrows and Mounds
17. Molelike Excavations and Simple Surface Trails
18. Tracks and Trails

To request an ID for a gall, or to see images of galls that have us stumped, please visit this page. Clicking the gray "Info" tab there will take you a page with links to BugGuide's pages for the major groups of gall-forming insects and mites.

p. 390

It seems to be safe to call the wasp that induced the oak pea gall in this photo Acraspis pezomachoides. There are several similar galls produced by wasps that were once considered separate species but are now treated as varieties of this species.