Stigmella microtheriella

Stigmella microtheriella is a moth of the Nepticulidae family. It is found in all of Europe. It is also present in the eastern Palearctic ecozone and the Australian region, where it is found in New Zealand (it was introduced here from Britain around 1850).

The wingspan is 3–4 millimetres (0.12–0.16 in). Adults are on wing in May and again in August.

The larvae feed on Corylus avellana and sometimes Carpinus betulus. Other recorded host are Carpinus orientalis, Corylus colurna, Corylus maxima, Ostrya carpinifolia and Ostrya virginiana. They mine the leaves of their host plant. The mines are narrow and often angular. Sometimes there can be several larvae mining the same leaf.