The bilateria member showing pentaradial symmetry is

Options

A. Nautilus
B. Neometra
C. Neomenia
D. Neopilina.

Answer

To solve the question "The bilateria member showing pentaradial symmetry is," we will follow these steps:

### Step 1: Understand the terms
- **Bilateria**: Refers to organisms that exhibit bilateral symmetry, meaning they can be divided into mirror-image halves along one plane.
- **Pentaradial symmetry**: Refers to a body plan that can be divided into five equal parts around a central axis, typical of echinoderms.

### Step 2: Identify the options
The question provides several options, which we need to analyze to find the correct answer.

### Step 3: Analyze each option
1. **Nautilus**: This is a mollusk that exhibits bilateral symmetry in its larval stage and asymmetry in its adult stage. Therefore, it does not show pentaradial symmetry.

2. **Numatra**: This is an echinoderm. It is bilaterally symmetrical during its larval stage but exhibits pentaradial symmetry in its adult stage. This matches the criteria given in the question.

3. **Pneumonia**: This is also a mollusk, exhibiting bilateral symmetry in its larval stage and asymmetry in its adult stage. Thus, it does not fit the description.

4. **Neupelina**: Similar to the previous options, this is a mollusk and shows bilateral symmetry in the larval stage and asymmetry in the adult stage. Therefore, it does not qualify.

### Step 4: Conclusion
Based on the analysis, the only organism that fits the description of being bilaterally symmetrical in the larval stage and exhibiting pentaradial symmetry in the adult stage is **Numatra**.

Thus, the correct answer is **Option 2: Numatra**.