What are the peculiar features that you find in parasitic platyhelminthes?

Explanation

### Step-by-Step Solution:

1. **Definition and Examples**:
- Parasitic Platyhelminthes are flatworms that live in or on the bodies of other organisms (hosts) and derive their nutrition from them.
- Common examples include **Taenia** (tapeworm) and **Fasciola** (liver fluke).

2. **Body Structure**:
- They are **dorsoventrally flattened**, which means their bodies are flattened from the top (dorsal) to the bottom (ventral).
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