I’d never even heard of a Hammerhead worm!...............
It would take RAID, or an entire can of unscented Right Guard deodorant to kill it. Hopefully, some hungry Buzzard will enjoy the taste.
Nor did I.
They are better known as planarians. They really aren’t a “worm”. They are very cool though. We get an invasive species here that I’ve seen up to three feet long.
We found the first one on our property in Georgia about 5 years ago. It’s my understanding that they post a threat to the small brown earthworm (or what we call the red wigglers).