Andricus singularis Mayr, 1870
Quercus cerris, gall (from Houard, 1908a).
Quercus ilex, gall (from Houard, 1908a).
A terminal or lateral bud is transformed into a green, thick-walled, pyriform gall of up to 8 mm length; on the gall some malformed leaves, or even anthers. In the gall a hard, brown, ovoid inner gall that is free only at its tip. Larva solitary, pupation in the gall. The gall can also take the form of a globular, up to 10 mm large, short-hairy swelling if the base of the axis of a male catkin.
Fagaceae, narrowly monophagous
Quercus cerris, ilex, suber.
Andricus singulus Mayr, 1881.
Only the sexual generation is known.
Buhr (1965a), Cerasa (2015a), Dauphin & Aniotsbehere (1997a), Hellrigl & Bodur (2015a), Hesse (1972a), Houard (1908a), Jennings (2014a), Jennings, Bowdrey & Jennings (2020a), Kwast (2014a), Melika (2006a), Melika, Csóka & Pujade-Villar (2000a), Roskam (2009a), Stone, Atkinson, Rokas, Nieves-Aldrey, Melika, Ács, Csóka, Hayward, Bailey, Buckee & McVean (2008a), Tomasi (2014a).