Name the phylum which includes radially symmetrical triploblastic animals.

Answer

To answer the question "Name the phylum which includes radially symmetrical triploblastic animals," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Radial Symmetry**: This refers to organisms that can be divided into similar halves by multiple planes passing through the central axis.
- **Triploblastic**: This refers to organisms that have three germ layers: ectoderm, mesoderm, and endoderm.

2. **Identify Relevant Phyla**:
- Two phyla are known for having radial symmetry: **Cnidaria** (which includes organisms like jellyfish and anemones) and **Echinodermata** (which includes starfish and sea urchins).

3. **Differentiate Between Diploblastic and Triploblastic**:
- Cnidaria is **diploblastic**, meaning it has only two germ layers.
- Echinodermata is **triploblastic**, meaning it has three germ layers.

4. **Conclusion**:
- Since the question specifically asks for triploblastic animals with radial symmetry, the correct answer is **Echinodermata**.

### Final Answer:
The phylum which includes radially symmetrical triploblastic animals is **Echinodermata**.

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