Bug Identifier
Horsehair Worm
Community identification

Horsehair Worm

Gordius robustus

Order & Family
Gordiacea: Gordiidae
Size
1 to 3 millimeters in diameter, 4 to 14 inches in length
See this bug in the Encyclopedia

Natural Habitat

Freshwater environments like streams, ponds, and water troughs; adults are aquatic, larvae are terrestrial parasites.

Diet & Feeding

Larvae are parasites of insects (crickets, grasshoppers, beetles); adults do not eat and live only to reproduce.

Behavior Patterns

Larvae develop inside a host insect and manipulate the host's behavior to find water. Once the host enters water, the adult worm emerges. They are often found knotted together in 'Gordian knots' during mating.

Risks & Benefits

Non-toxic and harmless to humans, pets, and plants. They are beneficial to the ecosystem as they help control populations of glasshoppers and crickets.