Achyra affinitalis, the cotton web spinner, is a moth of the family Crambidae.

It was described by Julius Lederer in 1863 and is found in Australia[1] and New Zealand.

[4] The larvae feed on Helianthus annuus, Medicago sativa, Linum usatissimum, Gossypium hirsutum, Sorghum bicolor and Atriplex species.

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