Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Apple barkminer (Marmara elotella) is a moth of the Gracillariidae family. It is known from the United States (including Massachusetts, Connecticut, Kentucky, Maine and Virginia). The larvae feed on Pyrus and Malus species, including Malus pumila and Malus sylvestris. They mine the twigs of their host plant. The larvae are sap feeders. 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 (about ten times the number of species of butterfly), with thousands of species yet to be described.