Trichoteras sp. B (Andricus sp.) [Russo suggests this may be a variant or close cousin of Andricus coquilletti]
Oak-apple-gall wasp
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Hosts: Quercus chrysolepis
This cynipid wasp induces round, thin-walled, hollow, monothalamous galls on the ventral midrib of leaves of canyon live oak.
Range: central Sierra Nevada, CA
”- Russo, Ronald A. : (2021) Plant Galls of the Western United States©