Phyllonorycter obscuricostella is a moth of the family Gracillariidae. It is known from Connecticut, Illinois, Kentucky, Pennsylvania, Maine and New York in the United States.[2]
| Phyllonorycter obscuricostella | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Gracillariidae |
| Genus: | Phyllonorycter |
| Species: | P. obscuricostella
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| Binomial name | |
| Phyllonorycter obscuricostella | |
| Synonyms | |
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The wingspan is 6-6.5 mm.
The larvae feed on Ostrya species, including Ostrya virginiana and Ostrya virginica. They mine the leaves of their host plant. The mine has the form of a small tentiform mine on the underside of the leaf. They are usually located between two veins. The pupa is formed inside of a thin silken web which occupies an entire half of the mine.
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