| Term | Definition |
|---|
| Examples: | free-living flatworms (planarians), flukes (Schistosoma), and tapeworms (Taenia) |
| Planarians | flat-worms |
| Schistosoma | flukes |
| Taenia | tapeworms |
| Digestion: | Incomplete, gastrovascular cavity |
| Nutrition: | scavengers, free-living and parasitic forms |
| Circulation: | none |
| Gas Exchange: | diffusion |
| Nervous System: | brain and ganglia (cluster of nervous cells), 2 nerve chords |
| Skeletal System: | none |
| Muscular System: | circular and longitudinal muscles |
| Excretion: | "flame cells" = cilia protonephridia (first kidneys) |
| Reproduction: | asexual (by regeneration) and sexual (hermaphroditic), parasitic forms often have complex life cycles |
| Unique Features: | flattened, bilateral body plan; acoelomates |
| Parasitic tapeworms have what two body parts? | scolex = head, and proglottids = body segements |
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