Fennoscandia
Guides
Boletina
fungus gnats
Boletina is a species-rich genus of fungus gnats in the family Mycetophilidae, characterized by a mainly Holarctic distribution. The genus has historically been taxonomically challenging due to morphological similarities among species and paraphyletic relationships with related genera including Aglaomyia, Coelosia, and Gnoriste. Recent molecular phylogenetic studies and taxonomic revisions have clarified some relationships, though the genus remains under active investigation. Boletina species are particularly diverse in northern Europe, where ongoing research continues to reveal new species.
Epirrita autumnata
Autumnal Moth
Epirrita autumnata, the autumnal moth, is a geometrid moth native to northern Fennoscandia and the Palearctic region. Its larvae feed primarily on mountain birch (Betula pubescens ssp. tortuosa and ssp. czerepanovii) foliage, with outbreaks capable of defoliating extensive birch forests. The species exhibits cyclic population dynamics with outbreak and non-outbreak phases. Eggs overwinter in diapause, showing exceptional cold hardiness with supercooling points reaching −36.5 °C. Adult females suffer substantial predation pressure from invertebrate predators, particularly harvestmen.
Metretopus
Metretopus is a genus of mayflies (Ephemeroptera) in the family Metretopodidae, containing at least two species: M. alter and M. borealis. These insects are found across northern regions of Europe, Russia, and North America. The genus has historically posed identification challenges, with M. alter frequently misidentified as M. borealis until morphological distinguishing characters were established.
Phronia
Phronia is a genus of fungus gnats (Diptera: Mycetophilidae) established by Winnertz in 1863. Species in this genus are found in boreal and arctic regions, with at least one species, Phronia reducta, documented from Salla in Finnish Lapland and Siberia. The genus belongs to the tribe Mycetophilini within the subfamily Mycetophilinae. Like other fungus gnats, members of Phronia are associated with decomposing organic matter and fungal habitats.
Sciaroidea
Fungus Gnats and Gall Midges
Sciaroidea is a superfamily of nematoceran flies in the infraorder Bibionomorpha, comprising approximately 16 families and over 15,000 described species. The group includes fungus gnats, gall midges, and related families, with larvae predominantly associated with fungi, dead wood, and soil. Fennoscandia represents a major biodiversity hotspot for this group, harboring roughly 1,000 species—about 83% of Europe's total. Despite substantial DNA barcoding efforts yielding over 56,000 barcode index numbers (BINs), only 5% currently have scientific names assigned, indicating vast undescribed diversity.