Mouth of Herdmania is

Options

A. Atrial apeture
B. Excurrent aperture
C. Branchial aperture
D. Both A and B

Answer

To answer the question "What is the mouth of Herdmania?" we need to analyze the options provided and understand the anatomy of Herdmania, a member of the subphylum Urochordata.

### Step-by-Step Solution:

1. **Identify the Organism**: Herdmania is a marine organism that belongs to the subphylum Urochordata. It is commonly referred to as a sea squirt.

2. **Understand the Options**: The options provided are:
- A) Atrial aperture
- B) Exterrent aperture
- C) Brachial aperture
- D) Both A and B

3. **Analyze the Atrial Aperture**: The atrial aperture is located on the dorsal side of the body of Herdmania. Since the mouth is not located on the dorsal side, this option can be eliminated.

4. **Analyze the Exterrent Aperture**: The exterrent aperture is associated with the excretory system and is not the mouth. It is related to the nasal tract, so this option is also incorrect.

5. **Analyze the Brachial Aperture**: The brachial aperture is located at the anterior end of the body and serves as the mouth for Herdmania. This is where water enters the organism, making it the correct option.

6. **Conclusion**: Since the brachial aperture is the correct answer, we can conclude that the mouth of Herdmania is the brachial aperture.

### Final Answer:
The mouth of Herdmania is the **brachial aperture**.