Sphenarches nanellus is a species of moth in the genus Sphenarches known from Brazil and Peru.

The host plant for the species is Eupatorium betonicaeforme.

Moths of this species take flight in March, May, and December and have a wingspan of approximately 9–11 millimetres (0.35–0.43 in).

This article on a moth of the family Pterophoridae is a stub.

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