A homocercal tail is found in

Options

A. Teleosts
B. Sharks
C. Rays
D. Lung fishes

Answer

To determine where a homocercal tail is found, we can follow these steps:

### Step-by-Step Solution:

1. **Define Homocercal Tail**:
- A homocercal tail is characterized by symmetrical lobes that are equal in size and shape, typically found in fish. The upper and lower lobes of the tail fin are nearly identical.

2. **Identify Classes of Fish**:
- Fish can be classified into various groups, including Agnatha (jawless fish) and Pisces (jawed fish). Within Pisces, there are further classifications such as Chondrichthyes (cartilaginous fish) and Osteichthyes (bony fish).

3. **Examine Tail Types**:
- In fish, there are different types of tails: homocercal, heterocercal, and diphycercal. Heterocercal tails have unequal lobes, while diphycercal tails have a symmetrical shape but are structured differently.

4. **Identify Fish with Homocercal Tails**:
- Homocercal tails are typically found in bony fish (Osteichthyes). Examples include many species of teleosts, which are a diverse group of bony fish.

5. **Conclusion**:
- Therefore, the correct answer to the question "A homocercal tail is found in" is **bony fish (Osteichthyes)**.