The larval mine of Stigmella lappovimella (Svensson, 1976) on Salix lapponum (L.) (Lepidoptera, Nepticulidae)

The larval mine of Stigmella lappovimella in leaves of Salix lapponum of different host leaf thickness is described and differences between the mine and the mines of Stigmella salicis on Salix caprea and Stigmella zelleriella on Salix repens are noted. The best diagnostic characters differentiating the mine of S. lappovimella from the two others was the almost unbroken frass line in the first half and the limited frass particle dispersion in the second half of the mine. Wing length was also measured and a small but statistically significant difference was observed between S. lappovimella and S. zelleriella.