(Figs 4K, 8B, 13 A–B)
Material examined. Russia: PK, Gornotaezhnoe, forest around MTS, 43.68N, 132.15E, 224 m alt., Malus mandshurica, 25.VII.2016, 1 male (reared from leaf mine), NK-179-16 - 1 A / [10Prin-2016-male] (Figs 4K, 8B); same location, Malus sp. 24.VII.2016, 1 female (reared from leaf mine), 70.1 / [3Prin-2016-female], deposited in SIF.
Leaf mine. The mine is a white elongated contracted blotch with very short or without preceding epidermal tunnel, along the leaf margin or between the secondary veins (Figs 13 A–B). Epidermis covering mine soon becomes brownish (Fig. 13B). From the upper side of the leaf, the mine has a marbled appearance (Fig. 13B). Pupation in the mine.
Trophic specialization. Oligophagous on Rosaceae: Malus baccata, M. domestica, M. mandshurica, M. pumila, M. sieboldii, M. toringo, Prunus padus, P. salicina, Pyrus sp. (De Prins & De Prins 2018).
Distribution. Russia: RFE—AO, PK, SO (Sakhalin Island) (Baryshnikova 2008, 2016), Siberia (Kirichenko et al. 2017b); Japan (Kumata 1959), Korea (Nakayama & Okamoto 1940), China (Kumata et al. 1983).