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).