Phytoptus erinotes (Nalepa, 1918)
up to 5 mm large, generally hypophyllous erineum with at the other side a sharply delineated bulge; the hairs of the erineum are cylindrical.
Malvaceae, narrowly monophagous
Phytoptus tetratrichus abnormis f. erinotes.
according to de Lillo (Fauna Europaea, 2014) this is a species from Central and South-East Europa. That would imply that recoords of erinotes from Britain are erroneous, and probably refer to Ph. tetratrichus. Whether the galls enable a discrimination between erinotes and Ph. abnormis seems dubious.
Amrine & Stasny (1994a), Buhr (1965a), Redfern & Shirley (2011a), Ripka (2007a).