Mayetiola joannisi Kieffer, 1896
The basal part of the stem, above the 2nd or 3rd node, is more or less swollen. Between the leaf sheath and the stem live here a variable number of white larvae, each in an oval shallow depression of the stem. Pupation within the gal, in a puparium.
The larva is described by Ertel (1975a).
spatula (from Kieffer, 1901a)
Poaceae, narrowly monophagous
Poa nemoralis, (pratensis).
Barnes (1958a), Buhr (1965a), Ertel (1975a), Gagné (2010a), Horeman (1990a), Houard (1908a), Kieffer (1896a, 1901a), Redfern & Shirley (2011a), Skuhravá & Skuhravý (2021a: 191), Skuhravá, Skuhravý, Dauphin & Coutin (2005a), Skuhravá, Skuhravý & Jørgensen (2006a), Skuhravá, Skuhravý & Meyer (2014a).