''Cosmopterix phyllostachysea'' is a moth of the family Cosmopterigidae. It is known from

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

( Jiangxi) and

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

.A study of Chinese Cosmopterix Hübner (Lepidoptera, Cosmopterigidae) with descriptions of new species
/ref> The length of the forewings is about 6 mm. The larvae have been recorded feeding on

Poaceae Poaceae () or Gramineae () is a large and nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns an ...

species in China and on '' Phyllostachys bambusoides'' in Japan. They mine the leaves of their host plant. The mine has the form of a linear-blotch mine. The linear starts small, but gradually widens. The last instar larvae create an oval chamber. It later makes a smaller overwintering chamber of silk-like fiber within this bigger chamber. After overwintering, the larvae begin feeding on the mesophyll in March.

References

phyllostachysea Moths of Japan {{Cosmopterix-stub