Andricus pellucidus Atrusca brevipennata, formerly Andricus pellucidus, also known as the little oak-apple gall wasp, is a locally common species of cynipid wasp that produces galls on oak trees in North America.

[1] The larval chamber is at the center of the gall, connected to the husk by slender, radiating fibers.

[1] This wasp is most commonly observed in the American Southwest, as far north as Denver.

[2] It is visually similar to, and may be confused with, Atrusca bella.

[1] Atrusca brevipennata was first studied and introduced to the scientific community by American biologist and sexologist Alfred Kinsey.