Tetramesa hyalipennis (Walker, 1832)
on Elymus, Elytrigia
galls on Elytrigia juncea subsp. boreoatlantica (left) and E. repens (right); from Claridge (1961a)
Elytrigia repens, Balkbrug, Oud Avereest, 16.vii.2020 © Arnold Grosscurt
Elytrigia repens, France, dép. Pas-de-Calais, Oye-Plage, RN Platier d’Oye, 23.x.2015 © Sébastien Carbonelle; wasps reared, det. Gérard Delvare
The top 3-4 internodes are very strongly shortened, their lateral walls are thickened, and the transverse walls in the nodes have disappeared. Th leaf sheaths form an elliptic mass, the leaf blades are practically lost. in the cavity of the internodes a single larva.
Harmolita hyalipennis; Isosoma hyalipenne; Isosoma, Tetramesa, graminicola auct. nec Giraud, 1863.
Illustrating this gall, Houard (1908a) mentions as the host plant “Ammophila arundinacea“, currently Ammophila arenaria subsp. arundinacea. The only Tetramesa mentioned from Ammophila in the more recent literature is T. eximia; however, that species makes different galls.
Bailey (1967a), Buhr (1964a), Claridge (1961a), Dauphin & Aniotsbehere (1997a), Dawah (1987a), Henneicke, Dawah & Jervis (1992a), Houard (1908a), Lambinon, Schneider & Chevin (2003a), Lehmann & Hannover (2016a), Redfern & Shirley (2011a), Roskam (2009a, 2019a), Tomasi (2012a, 2014a).