[1] Ameristus Förster 1869, Diplobius Kinsey 1923, Dolichostrophus Ashmead 1887, Neospathogaster Kinsey 1923, Spathegaster Hartig 1840, furunculus Beyerinck 1882, ostreus Giraud 1859, ostria Hartig 1840, Andricus ostreus, Neuroterus schlechtendali and Andricus furunculus are all previous nomenclatures found in the literature.

[2] The oyster gall is found on the leaf underside, rarely above, and is around 0.3 cm across, located between the midrib and the lateral veins.

[1] It develops under the lower epidermis and when it emerges it has two flaps of valve-like tissue which remain, even after the gall has fallen.

The gall has also been recorded as green, brown, pink and even with red spots.

[1] Emerging in autumn the parthenogenetic female of the agamic generation developed in the unilocular and unilarval bean-shaped structure, which is about 0.8 cm across, known as the 'oyster gall'; they lay eggs within the buds which result in the bisexual generation.