Pseudopostega elachista is a moth of the family Opostegidae. It was described by Walsingham, Lord Thomas de Grey, in 1914.Generic Revision of the Opostegidae, with a Synoptic Catalog of the World's Species (Lepidoptera: Nepticuloidea) It is known from Guerrero, Mexico.
The length of the forewings is about . Adults have been recorded in September.
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