Bradysia giraudii
(Egger, 1862)
Bradysia giraudii is a of dark-winged fungus gnat in the Sciaridae. The species was originally described as Phora giraudii by Egger in 1862 and has been placed in the Megaselia (family Phoridae) in some taxonomic treatments, though current consensus places it in Bradysia. The genus Bradysia includes species commonly associated with decaying organic matter and houseplant pots.
Pronunciation
How to pronounce Bradysia giraudii: /ˈbrædɪsiə dʒɪˈroʊdi.aɪ/
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Distribution
Distribution records indicate presence in the Azores (Faial, Pico, Terceira), Denmark (DK), and Norway (NO).
Human Relevance
Members of the Bradysia, including B. giraudii, are among the most commonly encountered fungus gnats in indoor environments. A 2019 study of nuisance arthropods in New Jersey apartments found that fungus gnats in the genus Bradysia comprised 42% of all flies captured in sticky traps, making them the most abundant fly group detected. These gnats are frequently associated with potted plants and moist organic matter.
Similar Taxa
- Megaselia giraudiiThis represents the same under an alternative taxonomic placement in Phoridae rather than Sciaridae. The GBIF treats Bradysia giraudii as a synonym of Megaselia giraudii, reflecting historical taxonomic uncertainty.
- Other Bradysia speciesNumerous Bradysia are morphologically similar and difficult to distinguish without examination. Many share the 'dark-winged fungus gnat' and similar ecological associations with decaying plant matter.
More Details
Taxonomic Uncertainty
The classification of this has been unstable. NCBI places it in Sciaridae ( Bradysia), while GBIF lists it as a synonym of Megaselia giraudii in Phoridae. This discrepancy reflects broader challenges in distinguishing sciarid and phorid flies, particularly for species described in the 19th century.