Amphibolips quercusinanis
(Osten Sacken, 1862)
larger empty oak apple wasp
Amphibolips quercusinanis is a in the that induces large, apple-sized on leaves of red oak in central and eastern North America. The species is notable for producing conspicuous, hollow galls that become brittle and empty after the emerges. It has been widely documented through citizen science observations.
Pronunciation
How to pronounce Amphibolips quercusinanis: //æmˈfɪbəlɪps ˌkwɜːrkjuːsɪˈnɑːnɪs//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from other oak apple by the combination of: large size (up to 2 inches diameter), bumpy and spotted but hairless exterior, formation on red oak leaves (Quercus coccinea, Quercus rubra), and the characteristic hollow, brittle state of mature after . The 'larger empty oak apple wasp' refers to this post-emergence condition. Similar include other Amphibolips species that form oak apples, but A. quercusinanis is specifically associated with red oaks and produces notably large galls.
Images
Habitat
Deciduous forests and woodlands containing red oak , particularly Quercus coccinea (scarlet oak) and Quercus rubra (northern red oak). formation occurs on leaf .
Distribution
Central and eastern North America. Specific range boundaries not detailed in available sources.
Seasonality
formation occurs in spring on leaf . Timing of not specified in available sources.
Host Associations
- Quercus coccinea - larval scarlet oak; formation on leaves
- Quercus rubra - larval northern red oak; formation on leaves
Life Cycle
develop within induced on red oak leaf in spring. Galls mature over the growing season, changing from green to . emerge from mature galls, after which the gall becomes hollow and brittle as internal nutritive tissue disintegrates. Specific details regarding -laying, , and stages not documented in available sources.
Behavior
induce formation on leaf . The manipulates host tissue to create a protective structure with internal nutritive fibers that sustain the developing larva.
Ecological Role
As a inducer, modifies oak leaf tissue to create and food source for its own development. Mature, empty galls may provide shelter for other small , though this has not been documented for this specifically.
Human Relevance
are conspicuous and may attract attention due to their large size and apple-like appearance. No economic or medical significance reported. Frequently documented by naturalists and citizen scientists.
Similar Taxa
- Other Amphibolips speciesForm similar oak apple , but A. quercusinanis is distinguished by its larger size, specific association with red oaks, and the characteristic hollow, brittle mature gall.
More Details
Gall structure
The internal architecture includes a central larval chamber connected to the vascular tissue via radiating nutritive fibers. This specialized tissue actively transports nutrients from the host to the developing . After , these fibers break down, leaving the characteristic empty .