Internal naris is present in

Options

A. Agnatha
B. Chondrichthyes and Osteichthyes
C. Choanicthyes
D. None of the above

Answer

To determine where internal nares are present, we need to analyze the options given: Agnatha, Chondrichthyes, Osteichthyes, and Choanichthyes.

### Step-by-Step Solution:

1. **Understanding Internal Naris**:
- Internal nares are openings that connect the nasal cavity to the pharynx. They allow for the passage of air from the nasal cavity to the throat.

2. **Analyzing Agnatha**:
- Agnatha refers to jawless vertebrates (e.g., lampreys and hagfish).
- In Agnatha, internal nares are absent.

3. **Analyzing Chondrichthyes**:
- Chondrichthyes are cartilaginous fish (e.g., sharks and rays).
- They possess external nares, but internal nares are also absent.

4. **Analyzing Osteichthyes**:
- Osteichthyes are bony fish (e.g., salmon, goldfish).
- Similar to Chondrichthyes, they have external nares, but internal nares are absent.

5. **Analyzing Choanichthyes**:
- Choanichthyes, also known as "lungfish" or "coelacanths," are a group of fish that possess internal nares.
- This group is characterized by having both external and internal nares.

6. **Conclusion**:
- Based on the analysis, the only group that possesses internal nares is Choanichthyes.

### Final Answer:
The internal nares are present in **Choanichthyes**.

---