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
variability
opened gall
larva
Elytrigia repens, France, dép. Pas-de-Calais, Oye-Plage, RN Platier d’Oye, 23.x.2015 © Sébastien Carbonelle; wasps reared, det. Gérard Delvare
gall
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.
host plants
Poaceae, monophagous
Elymus caninus; Elytrigia intermedia, repens.
parasitoids, predators
Eupelmus messene, vesicularis; ? Torymus baudysi.
synonyms
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.
references
Bailey (1967a), Buhr (1964a), Claridge (1961a), Dauphin & Aniotsbehere (1997a), Dawah (1987a), Fusu (2017a), de Vere Graham & Gijswijt (1998a), Henneicke, Dawah & Jervis (1992a), Houard (1908a), Koponen & Vikberg (2016a), Lambinon, Schneider & Chevin (2003a), Lehmann & Hannover (2016a), Redfern & Shirley (2011a), Roskam (2009a, 2019a), Tomasi (2012a, 2014a).