A paper based on the discovery was published in 2019. The first academic record of these worms in Canada dates back to May 2018, when the hammerhead flatworm was spotted in Montreal. MGOI is an independent non-profit organization supporting home gardeners. “It hasn't been recorded through us … but that doesn't mean it's not here because people don't go sifting through their soil to look for these things,” said Cathy Kavassalis, the social media administrator for Master Gardeners of Ontario Inc., in a telephone interview with CTVNews.ca on May 18. Sign up for The Climate Barometer, delivered right to your inbox.Most recently, they have been spotted in Ohio. The worms produce a neurotoxin used to paralyze prey, including earthworms, and there is the potential for harm to humans if these worms are touched. Hammerhead flatworms are an invasive species, meaning they are not native to Canada. Although it’s been years since any official sightings of the hammerhead flatworm in either Ontario or Quebec, one organization says it’s only a matter of time before they’re reported in Canada again.

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