The Blue Pseudoceros Flatworm can grow up to 2 inches and has no problem crawling around on the sea floor because of its colors which help it hide very well. These Flatworms only have one opening for eating and expelling waste material. The Blue Pseudoceros Flatworm moves just like the Leopard Flatworm its body moves in a wave like position to propel itself through the water and it can also go under rocks because of its very flat body.