| 1. | Alimentary canal is complete with a well-developed muscular pharynx. |
| 2. | An excretory tube removes body wastes from the body cavity through the excretory pore. |
| 3. | Sexes are separate (dioecious), i.e., males and females are distinct. |
| 4. | Often females are shorter than males. |
| 1. | Obelia | Metagenesis |
| 2. | Planaria | Free living with high regeneration capacity |
| 3. | Ancylostoma | Acoelomate |
| 4. | Nereis | Parapodia |
| 1. | Alimentary canal is complete with a well-developed muscular pharynx. |
| 2. | An excretory tube removes body wastes from the body cavity through the excretory pore. |
| 3. | Sexes are separate (dioecious), i.e., males and females are distinct. |
| 4. | Often females are shorter than males. |