-
- Phylum: Cnidaria
- Class: Schyphozoa
- Rep: aurelia planula
-
- Phylum: Cnidaria
- Class: Scyphozoa
- Rep: aurelia scyphistoma
-
- Phylum: Cnidaria
- Class: Scyphozoa
- Rep: Aurelia strobila
-
- Phylum: Nematoda
- Rep: Trichinella
-
- Phylum: Annelida
- Class: Oligochaeta
- Rep: Lumbricus
- typhlosole (circle)
- intestines (wrap around)
- coelom (space)
- ventral nerve cord (bottom circle)
-
- Phylum: Platyhelminthes
- Class: Trematoda
- Rep: Clonorchis
- black= intestines
- dots= testes
-
- Phylum: Cnidaria
- Class: hydrozoa
- Rep: hydra
- engorged
-
- Phylum: Platyhelminthes
- Class: Turbellaria
- Rep: Dugesia
- black: gastrovascular cavity
- eyespots
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