The organisms which are restricted to a narrow range of salinity are known as

Options

A. Salinosomes
B. Salinotolerants
C. Euryhaline
D. Stenohaline

Answer

To solve the question, "The organisms which are restricted to a narrow range of salinity are known as," we will analyze the options provided and identify the correct term.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a specific term that describes organisms limited to a narrow range of salinity. Salinity refers to the concentration of salts in water, and different organisms have varying tolerances to these salt levels.

2. **Evaluating the Options**:
- **Option 1: Salinosomes**: This term does not refer to organisms based on their salinity tolerance. Therefore, this option is incorrect.
- **Option 2: Salinotolerants**: This term generally refers to organisms that can tolerate varying levels of salinity, not restricted to a narrow range. Thus, this option is also incorrect.
- **Option 3: Urehylene**: Urehylene organisms can tolerate a wide range of salinity levels, making this option incorrect as well.
- **Option 4: Stenohaline**: This term specifically refers to organisms that are restricted to a narrow range of salinity. They cannot tolerate significant changes in salinity.

3. **Conclusion**: Based on the analysis of the options, the correct answer is **Stenohaline** organisms, which are indeed restricted to a narrow range of salinity.

### Final Answer:
The organisms which are restricted to a narrow range of salinity are known as **Stenohaline**.

---