Which of the following statement is not correct related to cyclostomata ?

Options

A. Jawless circular mouth
B. Body is devoid of scales but paired fins are present
C. Cranium and vertebral column are cartilaginous
D. Circulation is closed type

Answer

To determine which statement is not correct regarding Cyclostomata, let’s analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Cyclostomata**: Cyclostomata is a class of jawless fish that includes species like lampreys and hagfish. They are characterized by their circular mouths and lack of jaws.

2. **Evaluating the Statements**:
- **Statement 1**: "Jawless circular mouth" - This statement is correct. Cyclostomata are indeed jawless and have a circular mouth.
- **Statement 2**: "Body is divided of scale but beard fins are present" - This statement is incorrect. Cyclostomata do not have scales on their bodies, and they also lack paired fins (often referred to as "beard fins" in the context of some species).
- **Statement 3**: "Cranium and vertebral column are cartilaginous" - This statement is correct. The cranium and vertebral column of Cyclostomata are made of cartilage.
- **Statement 4**: "Circulation is closed type" - This statement is correct. Cyclostomata have a closed circulatory system where blood is contained within vessels.

3. **Identifying the Incorrect Statement**: From the evaluation, the second statement is the one that is not correct concerning Cyclostomata.

### Conclusion:
The statement that is not correct related to Cyclostomata is: **"Body is divided of scale but beard fins are present."**