Stigmella ilsea is a moth of the family Nepticulidae. It is endemic to New Zealand and has been observed in the North and South Islands. The larvae of this species are leaf miners and feed on Olearia virgata, Olearia rugosa, Olearia odorata, Olearia laxiflora, Olearia lineate and Olearia hectorii. Adult moths have been recorded in January, October and November. Reared specimens emerged from July to September. There is likely one generation per year.

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