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A voracious predator of earthworms, this species is distinguished by the single maroon line running down its yellow body. It crawled slowly and left a track of shiny, mucoid secretions on the plank.
I found it underneath a decomposing wood plank that housed a termite and carpenter ant colony.
Bipalium is an invasive species in the US. Although found on land, this hammerhead worm produces tetrodotoxin to paralyze its prey, the same compound in pufferfish and a few other fish.