Mollusc-eating Hammerhead Worm

I found this flatworm in my garden in Bangkok

I just found my first hammerhead worm underneath a self watering flower pot on the edge of my herb bed. I do not think I like the looks of this worm. I certainly don't want this worm to eat my beneficial earthworms!
I read the University of Florida report about this worm and I am not encouraged. It appears that these imports are probably getting around in potted plants we buy at our garden shops! which are carried from the greenhouses. Gee, thanks Burpee! and/or Bonnie Bell!
I think the next time I find one, I will put it in a jar of alcohol. I do not want to encourage this worm to grow and get into my vegetable garden; or my herb beds.
I think I like my friendly earthworms better!

The following link connects to a paper about the differences between the three most common broadhead planarians now found in North America. It includes a figure showing the color pattern differences among their heads.

http://faculty.kutztown.edu/butler/ducey2007.pdf

If that doesn't work, the article was published in the Southeastern Naturalist 6:449-460 in 2007.