Tentacles are replaced by captacula in

Options

A. pila
B. Dentalium
C. Neopilina
D. Both B and C

Answer

To solve the question "Tentacles are replaced by captacula in," we will follow these steps:

### Step 1: Understand the Terms
- **Tentacles**: These are elongated, flexible structures that many mollusks use for various functions, including feeding and sensing their environment.
- **Captacula**: These are specialized structures that replace tentacles in certain mollusks, particularly in the genus Dentalium. They are used for capturing food.

### Step 2: Analyze the Options
The options given are:
1. Pila
2. Dentalium
3. Neophyllina
4. Both B and C

### Step 3: Identify the Correct Answer
- **Pila**: This is a genus of land snails and does not have captacula replacing tentacles.
- **Dentalium**: This is a genus of marine mollusks known as tusk shells, where tentacles are indeed replaced by captacula.
- **Neophyllina**: This is another group of mollusks that does not have captacula replacing tentacles.
- **Both B and C**: Since only Dentalium has captacula replacing tentacles, this option is incorrect.

### Step 4: Conclusion
Based on the analysis, the correct answer is **Dentalium** (Option 2).

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