Which of the following traits is not characteristics of echinoderms ?

Options

A. Water vascular system
B. Trochophore larva
C. Tube feet
D. Enterocoel

Answer

To determine which trait is not characteristic of echinoderms, we can follow these steps:

### Step 1: Understand Echinoderms
Echinoderms are a group of marine animals that include starfish, sea urchins, and sea cucumbers. They are known for certain distinct features.

### Step 2: Identify Key Characteristics of Echinoderms
1. **Spiny Skin**: Echinoderms have a spiny or prickly skin, which is a defining feature.
2. **Water Vascular System**: They possess a unique water vascular system that aids in movement and feeding.
3. **Tube Feet**: These are small, tube-like structures that help in locomotion and feeding.
4. **Coelom Development**: Echinoderms have a coelom that develops as a mesoderm pouch from the gut of the embryo.

### Step 3: Examine the Options
Now, we need to analyze the options provided in the question to identify which one does not belong to the characteristics of echinoderms.

### Step 4: Identify the Incorrect Trait
- **Trochophore Larvae**: This type of larva is typically found in some annelids and mollusks, not echinoderms. Therefore, this trait is not characteristic of echinoderms.

### Conclusion
The trait that is not characteristic of echinoderms is **trochophore larvae**.

### Final Answer
**Trochophore larvae** is the trait that is not characteristic of echinoderms.

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