In which of the following chlorocruorin pigment is found ?

Options

A. Annelida
B. Echinodermata
C. Insecta
D. Lower Chordata

Explanation

To answer the question regarding the presence of chlorocruorin pigment, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chlorocruorin**: Chlorocruorin is a type of respiratory pigment that is similar to hemoglobin but is found in certain invertebrates. It is known for its greenish color and is involved in the transport of oxygen.

2. **Identifying the Groups**: The question provides several options: Annelida, Echinodermata, Insecta, and Lower Order Types. We need to determine which of these groups contains chlorocruorin.

3. **Analyzing Annelida**: Annelida is a phylum that includes segmented worms. Within this phylum, there is a class called Polychaeta, which is known to contain species that have chlorocruorin as a respiratory pigment.

4. **Examples of Polychaetes**: Some examples of polychaetes that contain chlorocruorin include Nereis (commonly known as sandworm) and Aphrodite. These organisms are characterized by their multi-segmented bodies and are typically found in marine environments.

5. **Conclusion**: Based on the information gathered, the correct answer to the question is that chlorocruorin pigment is found in **Annelida**.

### Final Answer:
Chlorocruorin pigment is found in **Annelida**.

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