Nemaxera is a genus of the fungus moth family, Tineidae. Therein, it belongs to the subfamily Nemapogoninae. The genus it is considered monotypic, with the single species Nemaxera betulinella placed here. The species occurs in western Eurasia east of France; it is also found in Great Britain but appears to be absent from the Balkans. Its caterpillars feed mainly on fungi, namely birch polypore (Piptoporus betulinus) and turkey tail (Trametes versicolor). To a lesser extent, they eat rotting wood. Junior synonyms of N. betulinella are: