Pseudovadonia livida, the fairy-ring longhorn beetle, is a beetle species of flower longhorns belonging to the family Cerambycidae, subfamily Lepturinae. This beetle is widespread in most of Europe, in East Palearctic ecozone and in the Near East. Habitat of larvae is the forest floor of pine forests. They do not develop in dead wood, as usual in many species of Cerambycidae, but in humus infested by fungus Marasmius oreades, feeding on mycelium.