Fungus Gnat
Scientific Name: Family Sciaridae / Family Mycetophilidae
Order & Family: Order: Diptera; Families: Sciaridae (Dark-winged) and Mycetophilidae
Size: 2 to 8 mm in length (the specimen in the image is significantly smaller than the adjacent penny).
Natural Habitat
Damp environments, particularly in houseplant soil, greenhouses, or decaying organic material.
Diet & Feeding
Larvae primarily feed on fungi, algae, and organic matter in soil; adults do not feed or may consume nectar/water.
Behavior Patterns
Attracted to moisture and carbon dioxide; weak fliers typically seen hovering near soil surfaces or window sills. They have a short life cycle of about 3 to 4 weeks.
Risks & Benefits
Generally harmless to humans but can be a nuisance pest. While larvae can damage young plant roots in heavy infestations, they also help break down organic matter in ecosystems.
Identified on: 3/12/2026