Phylums Platyhelminthes Phyla Platyhelminthes and Nematoda Platyhelminthes are flatworms and the nematodes are roundworms. Flatworms are flattened dorso-ventrally, and have bilateral symmetry. Many of them have primitive sensory organs and eyespots which can sense light.
Roundworms have a pseudocoel, which is a fluid filled body cavity.
This serves as a kind of skeleton for support and muscle attachment. First we collected samples of deer feces. We put these in the funnels and glasses pictures here to let the brainworms get into the water. Then we took samples of the water and looked at them under the microscope, which you can see in the picture below.