I first saw a post about this on Facebook and thought, oh, come on! This has to be a joke! It's not, and it's moving north... Here is an article about one of these nasty things from a little closer to Nebraska.
Excerpt from the article that you can read here:
"Originating in Southeast Asia, the hammerhead flatworm likely entered the U.S. in the early 1900s aboard imported landscaping materials. It is a terrestrial flatworm, typically honey-colored with one to five dark stripes running the length of the body. The Texas Invasive Species Institute reports the body as being narrow, “snake-like” and up to 15 inches long, with 8-12 inches being the most common.
The hammerhead flatworm could be very detrimental to area agriculture if the population grew too large, since Humphrey said they are known earthworm predators."