Ventral mouth is seen in

Options

A. Scoliodon
B. Petromyzon
C. Catla
D. Salamandra

Answer

To answer the question "Ventral mouth is seen in," we need to analyze the characteristics of various groups of organisms, particularly focusing on the cephalocordates and their anatomical features.

### Step-by-Step Solution:

1. **Understanding Cephalocordates**: Cephalocordates, also known as lancelets, are a group of marine organisms that possess a notochord. They are characterized by their elongated bodies and a notochord that runs along the length of their body.

**Hint**: Remember that cephalocordates are marine organisms with a notochord.

2. **Location of the Notochord**: In cephalocordates, the notochord is persistent and extends throughout the body. This is a key feature that distinguishes them from other groups.

**Hint**: Focus on where the notochord is located in cephalocordates.

3. **Mouth Position**: The mouth of cephalocordates is located on the ventral side (the underside) of their body. This is an important anatomical feature that helps in identifying them.

**Hint**: Recall the anatomical orientation of cephalocordates, particularly the position of their mouth.

4. **Conclusion**: Given that the question asks about the ventral mouth, we can conclude that cephalocordates are indeed the organisms that possess a ventral mouth.

**Hint**: Think about the overall body plan of cephalocordates and their mouth orientation.

### Final Answer:
The ventral mouth is seen in cephalocordates.