Feron gigas
(Kinsey, 1922)
Saucer Gall Wasp
Feron gigas, the saucer gall wasp, is a cynipid that induces distinct galls on oak leaves. It exhibits an alternating with morphologically different galls produced by all-female (agamic) and bisexual generations. The is associated with several oak species in western North America and has been widely documented through citizen science observations.
Pronunciation
How to pronounce Feron gigas: /ˈfɛɹɒn ˈɡiːɡæs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
The all-female produces diagnostic circular galls 3–4 mm wide with raised edges and a central raised bump containing the larval chamber. These galls are red, pink, brown, or purple. The bisexual generation produces brown, cone-shaped galls. These distinct gall morphologies allow separation from other Feron on the same oaks.
Images
Habitat
Found in oak woodland and scrubland where oaks (Quercus spp.) occur. Associated with scrub oak, blue oak, and Engelmann oak .
Distribution
Western North America, occurring where oaks are present. Specific range boundaries are not precisely documented in available sources.
Seasonality
The all-female emerges in winter. Timing of the bisexual generation is not specified in available sources.
Host Associations
- Quercus berberidifolia - induces galls on leavesscrub oak
- Quercus douglasii - induces galls on leavesblue oak
- Quercus engelmannii - induces galls on leavesEngelmann oak
Life Cycle
Alternating with all-female (agamic) and bisexual generations. The all-female generation produces circular, colorful galls; the bisexual generation produces brown, cone-shaped galls. Larval development occurs within the gall tissue.
Behavior
Induces gall formation on oak leaves through chemical manipulation of plant tissue. The mechanism of gall induction has not been described in detail.
Ecological Role
Creates and food resources for and associated with cynipid galls. Forms a component of the diverse oak gall wasp .
Human Relevance
Subject of citizen science documentation through iNaturalist with over 2,000 observations. No documented economic or agricultural significance.
Similar Taxa
- Other Feron speciesOther cynipids in the Feron also induce galls on oaks; F. gigas is distinguished by the specific combination of circular, colorful galls with raised edges (all-female ) and brown cone-shaped galls (bisexual generation)