Stigmella ilsea
Encyclopedia
Stigmella ilsea is a moth
Moth
A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...

 of the Nepticulidae
Nepticulidae
Nepticulidae is a family of very small moths with a worldwide distribution. They are characterised by eyecaps over the eyes . These pigmy moths or midget moths, as they are commonly known, include the smallest of all living moths, with a wingspan that can be as little as 3 mm...

 family. It is found in New Zealand
New Zealand
New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

.

The length of the forewings is about 2 mm. Adults have been recorded in January, October and November. Reared specimens emerged from July to September. There is probably one generation per year.

The larvae feed on Olearia virgata, Olearia rugosa, Olearia odorata, Olearia laxiflora, Olearia lineate and Olearia hectorii. They mine
Leaf miner
Leaf miner is a term used to describe the larvae of many different species of insect which live in and eat the leaf tissue of plants. The vast majority of leaf-mining insects are moths , sawflies and flies , though some beetles and wasps also exhibit this behavior.Like Woodboring beetles, leaf...

the leaves of their host plant. The mine starts as very narrοw gallery, but a full-grown larva occupies all space between the cuticles, leaving nothing but a small, empty bladder. Larva have been recorded from February to May and in July and September. They are 2–3 mm long and pale yellow.

The cocoon is pale brown and spun in detritus on the ground.

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