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This cool design was "tattooed" on this leaf.

I found it on the windshield of my car.

What's up with it?enter image description here

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    $\begingroup$ +1 for the superb photograph. :) $\endgroup$ – Wossname Jun 3 at 18:28
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    $\begingroup$ @JossieCalderon would you mind sending it to me? For uh... Testing purposes. $\endgroup$ – LogicalBranch Jun 4 at 18:35
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That is the work of a leaf miner. A leaf miner is the larval stage of an insect that feeds on the inside layer of leaves. Notice how the galleries (tunnels) start small and then get larger as the larva matures? Most leaf miners are moth larvae (Lepidoptera) https://en.wikipedia.org/wiki/Leaf_miner

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    $\begingroup$ It's pretty amazing that it uses quite a bit of the available area, pretty efficiently. $\endgroup$ – Steve Jun 3 at 22:22
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    $\begingroup$ I love this caption from the wiki page photo: "Leaf with minor miner damage". $\endgroup$ – pyro Jun 4 at 9:21
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    $\begingroup$ @pyro Since the miner isn't an adult, you could even describe it as minor miner minor damage! $\endgroup$ – David Richerby Jun 4 at 16:10
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    $\begingroup$ OP should add his pic to wiki article. $\endgroup$ – Michael_B Jun 5 at 23:54
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This leafminer is a moth in the genus Phyllocnistis (Gracillariidae). If you knew what plant the leaf came from, the moth could probably be identified to species. The marginal leaf fold at lower right is where the mature larva has spun its cocoon.

Incidentally, I'm just finishing a complete guide to the known leafminers of North America. There are many species left to be discovered though!

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