Hammerhead Worms in Texas?

June 18, 2025 – Hammerhead flatworms, an invasive species known for their distinctive hammer-shaped heads, are making a noticeable comeback in Texas following recent heavy rainfall. These flatworms can grow up to 15 inches long and thrive in moist, warm environments, which explains their increased sightings across the state after the wet weather. Although their unusual appearance may catch attention, these creatures pose real ecological and health concerns.

Hammerhead flatworms are highly predatory and primarily feed on earthworms, which are essential for maintaining healthy soil and supporting local ecosystems. By diminishing earthworm populations, hammerhead flatworms can indirectly harm plant growth and soil quality. Additionally, they secrete a neurotoxin through their skin, which can cause skin irritation in humans and can be dangerous if ingested by pets.

Handling these worms requires caution. Experts recommend never cutting or crushing them, as they can regenerate from small body fragments. Instead, they should be carefully placed in a sealed plastic bag and either frozen or treated with salt or vinegar to ensure proper disposal. Residents are encouraged to report sightings to local invasive species authorities to help monitor their spread. As Texas continues to see wet conditions, awareness and safe handling practices are key to managing this persistent pest.

The name Bipalium comes from Latin bi-, “two” + pala, “shovel” or “spade”, because species in this genus resemble a pickaxe.

Author: KSST Webmaster

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