Aequsomatus annulatus (Nalepa, 1897)
on Rhamnus

Rhamnus catharticus, Belgium, prov. Namur, Rochefort, Tienne de Boton © Carina Van Steenwinkel

erineum trichomes

detail

mite

Rhamnus cathartica, Hungary, Budapest, 20.v.2016 © László Érsek: fresh gall

erineum

erineum trichomes

Rhamnus cathartica, Hungary, Budapest, 8.ix.2018 © László Érsek: old gall

underside
gall
weak, (generally) hypophyllous erineum. The erineum trichomes are slender-fusiform, multicellular, with an obtuse apex.
hostplants
Rhamnaceae, narrowly monophagous
Rhamnus alaternus, cathartica.
Máca found the gall also on Frangula alnus.
synonyms
Aceria annulata; Eriophyes, Phyllocoptes, annulatus.
references
Béguinot (2006b), Dauphin & Aniotsbehere (1997a), Farkas (1965a), Hellrigl (2003a), Houard (1909a), Lambinon, Carbonnelle & Claerebout (2015a), Ludwig (1974a), Máca (2012a), Redfern & Shirley (2011a), Ripka (2007a), Roivainen (1947a, 1950a), Roskam (2009a), Tomasi (2014a), Weidner (1954a).