An animal having unsegmented coelom, superficial radial symmetry in adult but bilateral symmetry in larva is a member of

Options

A. Mollusca
B. Echinodermate
C. Arthropoda
D. Annelida

Answer

To solve the question, we need to identify the characteristics of the animal in question and match them with the options provided. Let's break down the solution step by step:

### Step 1: Analyze the Characteristics
The question describes an animal with the following features:
- Unsegmented coelom
- Superficial radial symmetry in adults
- Bilateral symmetry in larvae

### Step 2: Evaluate Each Option
Now, we will evaluate each of the given options based on the characteristics identified.

1. **Mollusca**:
- Mollusks are generally unsegmented but exhibit bilateral symmetry in both larvae and adults.
- **Conclusion**: Does not match.

2. **Echinodermata**:
- Echinoderms have an unsegmented coelom.
- They exhibit bilateral symmetry in their larval stage and superficial radial symmetry in their adult form.
- **Conclusion**: Matches all characteristics.

3. **Arthropoda**:
- Arthropods are segmented and exhibit bilateral symmetry in both larvae and adults.
- **Conclusion**: Does not match.

4. **Annelida**:
- Annelids are also segmented and show bilateral symmetry in both stages.
- **Conclusion**: Does not match.

### Step 3: Identify the Correct Answer
Based on the analysis, the only option that fits all the characteristics described in the question is **Echinodermata**.

### Final Answer:
The animal having unsegmented coelom, superficial radial symmetry in adults, and bilateral symmetry in larvae is a member of **Echinodermata**.

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