| Flap covering mouth that senses light/dark, food, & vibration | | |
| Makes mucous for reproduction | | |
| Collects and removes nitrogen waste | | |
| Absorbs nutrients & collects digestive waste | | |
| Space surrounding body organs | | |
| Ridge inside intestine for more surface area | | |
| Pump blood | | |
| Pulls food into digestive system | | |
| Store food | | |
| Grind food | | |
| Store own sperm to give away | | |
| Store sperm received from other worms | | |
| Walls that divide coelom into compartments | | |
| Traction bristles | | |
| Non cellular protective covering | | |