Bug Identifier
Hammerhead Worm
Community identification

Hammerhead Worm

Bipalium kewense

Order & Family
Order: Tricladida; Family: Geoplanidae
Size
Typically 5 to 20 cm in length, though some can grow up to 30 cm or more.
See this bug in the Encyclopedia

Natural Habitat

Damp, humid environments such as under rocks, logs, or leaf litter; often found in greenhouses or gardens.

Diet & Feeding

Carnivorous and predatory, primarily feeding on earthworms, slugs, insect larvae, and snails.

Behavior Patterns

Nocturnal and photophobic; uses a sticky secretion to trap prey and external digestion to consume it. Capable of asexual reproduction through fragmentation (regrowing from severed pieces).

Risks & Benefits

Invasive species that disrupts soil ecosystems by preying on beneficial earthworms. They produce tetrodotoxin (a potent neurotoxin), so they should not be handled with bare hands or consumed by pets.