A mismatch is

Options

A. Odd toe-Horse
B. Pheretima-parapodia
C. Hydra- Cnidaria
D. Cartilaginous Fish-Shark

Answer

To solve the question "A mismatch is", we need to analyze the given options and determine which one does not correctly belong to its respective category.

### Step-by-Step Solution:

1. **Identify the Options**:
- Option 1: Odd toe horse
- Option 2: Ferritima parapodia
- Option 3: Hydranidaria
- Option 4: Cartilaginous fish shark

2. **Analyze Option 1: Odd Toe Horse**:
- The horse is classified as an odd-toed ungulate. This means it has an odd number of toes on its hooves (specifically one toe). This classification is correct.

3. **Analyze Option 2: Ferritima Parapodia**:
- Ferritima is a genus of earthworms, which are soil-burrowing animals. Parapodia are structures found in some aquatic animals (like Nereis) that help in swimming. Since Ferritima does not possess parapodia, this is a mismatch.

4. **Analyze Option 3: Hydranidaria**:
- Hydra belongs to the phylum Cnidaria. Cnidarians are characterized by the presence of specialized cells called cnidocytes (which contain nematocysts). This classification is correct.

5. **Analyze Option 4: Cartilaginous Fish Shark**:
- Sharks are classified under the class Chondrichthyes, which are known as cartilaginous fish. This classification is also correct.

6. **Conclusion**:
- After analyzing all the options, it is clear that the second option, Ferritima parapodia, is the only mismatch. Therefore, the answer to the question is **Ferritima parapodia**.

### Final Answer:
The mismatch is **Ferritima parapodia**.