Rectiostoma argyrobasis is a moth in the family Depressariidae. It was described by W. Donald Duckworth in 1971. It is found in the humid low highlands of northern Venezuela and south-eastern Brazil."Rectiostoma Becker in Heppner, " at Markku Savela's Lepidoptera and Some Other Life Forms.
The wingspan is 14–16 mm. The forewings are white basally, tinged with yellow on the costal edge. The distal margin of the white area is bordered by a dark brown line immediately paralleled by a broad, transverse band of iridescent blue violet. The apical half of the forewing is dark brown suffused with iridescent bronze-to-violet scales. The hindwings are dark brown with a white patch on the anterior margin and white hair-pencils along the anal veins.Smithsonian Contributions to Zoology 106: 25
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