Gnamptonoma leptura is a moth of the family Agonoxenidaefunet.fi and the only species in the genus Gnamptonoma. It is only known from its types from Ecuador.
It has a wingspan of 8mm. Its forewings are dark bronzy fuscous, with a whitish-ochreous dorsal streak from base occupying nearly half of wing, sprinkeled with blackish specks on costa.Meyrick, 1917: 65
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