Texas Rainfall Brings Out ‘Toxic’ Worms that Regenerate When Chopped in Half

The recent excessive rainfall in the Houston area has brought an unexpected and toxic guest out of hiding: the hammerhead flatworm. These invasive worms, known for their distinctive hammer-shaped heads, emerge from their subterranean homes due to the massive amounts of precipitation.

Danger Lurking in Your Yard

These flatworms can grow up to 15 inches long and secrete a toxin that can irritate human skin and potentially make pets sick if ingested. The Texas Invasive Species Institute (TISI) warns that these worms are commonly found in hot and humid climates, making Houston an ideal habitat.

"They live where earthworms live, so with the heavy rains, they tend to get flushed out," said Ashley Morgan-Olvera, the research director at TISI, in an interview with FOX Weather .

A Threat to More Than Just Earthworms

Hammerhead flatworms are predators, feasting on earthworms essential for soil health. They immobilize their prey with a toxic slime before digesting them.

These same toxins pose risks to humans and pets. Worms can also carry parasites, adding another layer of danger.

Regeneration and Reproduction

One of the most concerning traits of hammerhead flatworms is their ability to regenerate. Cutting one into pieces will result in multiple new worms, each capable of becoming a new predator in your yard.

Safe Disposal Methods

If you encounter a hammerhead flatworm, it's crucial to handle it correctly. The TISI recommends wearing gloves and using a stick or paper towel to avoid direct contact.

Place the worm in a plastic bag with salt and vinegar or citrus oil, and then freeze it overnight to ensure it is completely destroyed. Never cut the worm, as this will only multiply the problem .

Reporting Sightings

Residents are encouraged to report sightings of these invasive worms to help track their spread. Photos and the location of the sighting can be sent to invasives@shsu.edu .

Be Worm Alert

With more rain expected, the likelihood of encountering these toxic invaders increases. Residents can help manage and mitigate the spread of hammerhead flatworms in Texas by taking the proper precautions and promptly reporting sightings.