Common bark louse

The common bark louse (<em>Amphigerontia contaminata</em>) is a psocid insect distributed across terrestrial and freshwater habitats in temperate regions. Confirmed records include Belgium, Denmark, Norway, Sweden, and the United States, pointing to a broad range across Europe and North America. Members of this genus are typically associated with bark, lichens, and algae-covered surfaces on trees and woody debris, where they graze on microorganisms and fine particulate organic matter. <em>Amphigerontia contaminata</em> is generally small and inconspicuous, making field identification challenging without close examination. Bark lice such as this species often form loose aggregations on suitable substrates, particularly under loose bark or among leaf litter. Their role in nutrient cycling within forest ecosystems, though modest, contributes to the decomposition of organic material. Biological traits of this species remain poorly documented in the scientific literature.