The Limacodidae or Eucleidae are a family of moths in the superfamily Zygaenoidea or the Cossoidea;[the placement is in dispute. They are often called slug moths because their caterpillars bear a distinct resemblance to slugs. The larvae are often liberally covered in protective stinging hairs, and are mostly tropical, but occur worldwide, with about 1800 described species and probably many more as yet undescribed species.