aka "White Flatworm".
This worm appears to eat small crustaceans like Copepods and has been rumored to eat other smaller flatworms. Unfortunately from my experiments it does not eat the dreaded "Red Planaria" aka Convolutriloba sp.
As illistrated by my photos below, this 1cm animal captures its prey by lifting its bulbous head, expanding it like a net, then clamping down against the surface and closing the "net". Copepods or other prey are then forced into the stomach and the process starts over.