| Term | Definition |
| Level of Organization | Organ |
| Layers of Tissue.. | Triploblastic |
| Middle layer is called... | Mesenchyme(derived from mesoderm) |
| Name the four main classes... | Turbellaria, Tremotoda, Cestoda, Monogenea |
| Free-Living(Flatworms) | Turbellaria |
| Endoparasitic(Flukes) | Trematoda |
| Endoparasitic(Tapeworms) | Cestoda |
| Ectoparasitic on fish | Monogenea |
| All flukes and tapeworms are... | Parasitic |
| Circulatory and Respiratory | None |
| Excretory System | Protonephridia |
| Food and oxygen transported via | diffusion |
| Reproduction | Asexual and sexual reproduction |
| Lack sensory and locomotive adaptations of free-living forms | Class Tremotoda |
| Symmetry | Bilaterally Symmetrical |
| Three cellular layers | ectodermal,endodermal, mesodermal germ layers |
| Body cavity surrounding the gut and completely lined with mesodermally derived tissue | true coelom |
| Bodies divides into____ (for attachment) neck and reproductive proglottids | Scolex |
| Digestive system includes... | mouth, pharynx, intestine |