Trichosia is a genus of fungus gnats that feed on decaying organic matter and fungi. The subgenus Mouffetina is treated by some as a genus, while Baeosciara was originally described as a genus.
Subgenus Baeosciara <small>Tuomikoski, 1966</small>
Subgenus Mouffetina <small>Frey, 1942</small>
Subgenus Trichosia <small>Winnertz, 1867</small>