Elachista argillacea is a moth of the family Elachistidae. It is found in California, United States.Kaila, L. 1997. A revision of the Nearctic species of Elachista s. l. II. The argentella group (Lepidoptera, Elachistidae). Acta Zoologica Fennica 206: 1–93.
The length of the forewings is 3.7–4.8 mm.
Etymology The species name is derived from Latin argilla (meaning white clay).
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