Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension

Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Insect relatives: Spiders, millipedes, centipedes, sowbugs, etc. - 2 inches and larger > Horsehair worms

Print Icon Email Icon Share Icon

Horsehair worms

Phylum Nematamorpha

Horsehair worm

Gary Averbeck

Description: 2 up to 14 inches long.

Where/When: They are found in freshwater or damp soils or surfaces, such as on plants.

Significance: They are parasites of insects, arthropods, and other invertebrates when they are immature and free-living as adults. Despite their appearance, they are harmless to people and plants.

More information on Horsehair worms

Did this tool help you identify the insect? Tell us.