Which of the following is not correctly matched?

Options

A. Acoelomates – Plathyelminthes
B. Acoelomates – Moliuscs
C. Pseudocoelomates – Ascheminthes
D. Coelomates – Arthropods

Answer

To determine which of the following options is not correctly matched, we need to analyze each option based on the classification of animals according to their body cavities.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Silomates**: Animals with a true coelom (body cavity lined by mesoderm).
- **Pseudosilomates**: Animals with a pseudocoelom (body cavity not completely lined by mesoderm).
- **Acoelomates**: Animals without a body cavity.

2. **Analyzing the Options**:
- **Option A**: Silomates - Platyhelminthes
- Platyhelminthes are Acoelomates, not Silomates. This option is incorrect.
- **Option B**: Silomates - Mollusca
- Mollusca are indeed Silomates, as they have a true coelom. This option is correct.
- **Option C**: Pseudosilomates - Aschelminthes
- Aschelminthes (now often referred to as Nematodes) are Pseudosilomates. This option is correct.
- **Option D**: Pseudosilomates - Arthropoda
- Arthropoda are Silomates, not Pseudosilomates. This option is incorrect.

3. **Identifying the Incorrect Matches**:
- From the analysis, both Option A (Silomates - Platyhelminthes) and Option D (Pseudosilomates - Arthropoda) are incorrect matches. However, since the question asks for one option that is not correctly matched, we can conclude that Option A is the first incorrect match identified.

### Conclusion:
The option that is not correctly matched is:
**A. Silomates - Platyhelminthes**.