An alien worm species has been sighted in Cambridge, prompting local scientists to seek public assistance in identifying additional locations where they may be present. Staff at the Rare Charitable Research Reserve recently discovered 15 hammerhead worms in the vicinity of their office. These worms are easily recognizable by their distinctive crescent-shaped heads and flat, broad bodies, and experts warn that they could pose a threat to various soil-dwelling creatures.
Michael McTavish, a conservation scientist at the Rare Charitable Research Reserve, discussed the discovery of the hammerhead worms with CBC Kitchener-Waterloo’s The Morning Edition host Craig Norris. The worms were found by chance in the backyard of the administrative office near the Grand River during educational activities. Although efforts to locate more of these worms in the area have been unsuccessful, the origin of their presence remains a mystery.
Describing the appearance of the hammerhead worms, McTavish explained that there are two documented species in Canada within the Bipalium genus. One species is smaller, measuring five to ten centimeters with a tan-yellowish color and a single stripe along its body. The larger species can reach lengths of 15 to 30 centimeters and features five stripes. These worms are known to be predators, primarily preying on soft-bodied invertebrates like snails, earthworms, and slugs.
The potential impact of these worms on soil ecosystems is not fully understood, but concerns arise from their predatory behavior and the neurotoxin they produce in their mucus. Originating from Asia, Madagascar, and other regions, these invasive worms likely arrived in North America through accidental transportation in horticultural materials. To aid in tracking the distribution of these invasive species, individuals are encouraged to report sightings through the EDDMapS online tool, which assists in verifying and documenting such observations for further research and management purposes.