The Lymantriinae (formerly called the Lymantriidae) are a subfamily of moths of the family Erebidae. The taxon was erected by George Hampson in 1893.
Many of its component species are referred to as "tussock moths" of one sort or another. The caterpillar, or larval, stage of these species often has a distinctive appearance of alternating bristles and haired projections. Many tussock moth caterpillars have urticating hairs (often hidden among longer, softer hairs), which can cause painful reactions if they come into contact with skin.
The subfamily Lymantriinae includes about 350 known genera and over 2,500 known species found in every continent except Antarctica. They are particularly concentrated in sub-Saharan Africa, India, Southeast Asia, and South America. One estimate lists 258 species in Madagascar alone. Apart from oceanic islands, notable places that do not host lymantriines include the Antilles and New Caledonia.
The larvae are also hairy, often with hairs packed in tufts, and in many species the hairs break off very easily and are extremely irritating to the skin (especially members of the genus Euproctis. This highly effective defence serves the moth throughout its life cycle. The hairs are incorporated into the cocoon. An emerging adult female of some species collects and stores the hairs at the tip of the abdomen and uses them to camouflage and protect the eggs as they are laid. In other species, the eggs are covered by a froth that soon hardens or are camouflaged by material the female collects and sticks to them. In the larvae of some species, hairs are gathered in dense tufts along the back and this gives them the common name of tussocks or tussock moths.
Lymantria means "destroyer", and several species are important defoliators of forest trees, including the spongy moth Lymantria dispar, the Douglas-fir tussock moth Orgyia pseudotsugata, and the nun moth Lymantria monacha. They tend to have broader host plant ranges than most Lepidoptera. Most feed on trees and shrubs, but some are known from vines, herbs, grasses, and lichens.
