A wood boring mollusca/Shipworm is

Options

A. Chiton
B. Teredo
C. Limax
D. Patella

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the classification of a wood-boring mollusk known as a shipworm.

2. **Identifying Shipworm**: Shipworms are a type of bivalve mollusk that are known for their ability to bore into wood, particularly submerged wood in marine environments.

3. **Classification**: Shipworms belong to the class **Bivalvia** (also known as **Pelecypoda**). This class is characterized by having two hinged shells (valves).

4. **Habitat**: Shipworms are typically found in **marine waters**, especially in saltwater environments, which is why they are sometimes referred to as saltwater clams.

5. **Common Names**: They are often called "termites of the sea" due to their wood-boring habits, similar to how termites consume wood on land. They are also referred to as "boatworms" because of their worm-like appearance.

6. **Specific Name**: The scientific name for the shipworm is **Teredo**. This is the correct answer to the question.

7. **Conclusion**: Therefore, the wood-boring mollusk known as a shipworm is classified as **Teredo**.