Blood vascular system is a distinctive feature of echinoderms.

Answer

### Step-by-Step Solution:

1. **Understanding Echinoderms**: Echinoderms are a group of marine animals that include species such as sea stars (starfish), sea urchins, and sea cucumbers.

2. **Identifying the Vascular System**: The question refers to the "blood vascular system." It is important to clarify that echinoderms do not possess a traditional blood vascular system like many other animals (e.g., mammals, birds).

3. **Water Vascular System**: Instead, echinoderms have a unique system known as the "water vascular system." This system is a network of fluid-filled canals that plays a crucial role in their movement and feeding.

4. **Functions of the Water Vascular System**: The water vascular system is involved in several functions:
- **Locomotion**: It helps in the movement of the echinoderm by controlling the tube feet.
- **Feeding**: It aids in the manipulation of food.
- **Respiration**: It assists in gas exchange.

5. **Conclusion**: Since echinoderms have a water vascular system instead of a blood vascular system, the statement "Blood vascular system is a distinctive feature of echinoderms" is **false**.

### Final Answer:
The statement is **false**.

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