The invasive "jumping worm" (genus Amynthas).

“At the University of Wisconsin-Madison Arboretum, study of the worms began after they were discovered on the grounds in 2013. ‘They may have a cascading, behind-the-scenes impact that might not happen tomorrow, but that will eventually affect other organisms at a higher trophic level,’ said Bradley M. Herrick, a plant ecologist and the research program manager at the arboretum.”

Read the full New York Times story by Margaret Roach, July 22, 2020