Species of moth
Acrocercops affinis is a moth of the family Gracillariidae, known from California, U.S.A.[1]
The hostplant for the species is an unidentified species of Quercus. They mine the leaves of their host plant. The mine starts as a narrow, white line, expanding abruptly into a large, white blotch. Within the blotch, most of the parenchyma is consumed.
References