Andricus tubularius

Distinguished from other Andricus species by the specific morphology of its gall, though detailed diagnostic features for this particular species are not well documented in available sources. As with many cynipid gall wasps, species-level identification relies heavily on gall characteristics and host plant association.

Associated with oak-dominated forests and woodlands where host trees occur.

Documented from North America based on limited iNaturalist observations; precise range boundaries are not well established.

Adult emergence and gall formation timing follow patterns typical of temperate cynipid wasps, with activity generally coinciding with oak leaf development in spring and early summer.

• Quercus - host plantSpecific oak host species not definitively established for this species.

Exhibits the typical cynipid gall wasp life cycle: females deposit eggs in oak tissue using an ovipositor, inducing gall formation through chemical secretions that manipulate plant growth. Larvae develop within the gall, feeding on specialized plant tissue, before pupating and emerging as adults. Many Andricus species have complex alternation of generations between sexual and parthenogenetic forms on different host tissues or species, though this has not been specifically documented for A. tubularius.

Females induce gall formation by injecting eggs into oak tissue along with chemical cues that redirect plant development. The larva develops in complete or partial isolation within the gall structure.

As a gall inducer, modifies oak tissue to create specialized microhabitats that may subsequently support inquilines, parasitoids, and other associated arthropods, contributing to local biodiversity in oak ecosystems.

• Other Andricus speciesShare genus-level characteristics of oak-associated gall induction; distinguished by gall morphology, host specificity, and often microscopic features.
• Other Cynipidae on oaksMany cynipid genera induce oak galls; Andricus is distinguished by specific gall types and life history patterns, though species-level separation requires detailed examination.

• gall wasp
• cynipid
• oak gall
• parasitoid
• plant manipulation
• Andricus
• Hymenoptera
• Cynipidae

• BugGuide
• iNaturalist taxon
• Gall darn it! Gall insects on hickory, oak, and elm, Phylloxera caryaecaulis, Andricus palustris, Colopha ulmicola — Bug of the Week
• Cynipidae | Beetles In The Bush
• The Insects Behind the Weird Growths on Plants
• Ted C. MacRae | Beetles In The Bush | Page 8