Which is not correctly matched?

Options

A. Annelida `rarr` Enterocoelomate
B. Platyhelminthes `rarr` Acoelomate
C. Arthropoda `rarr` Schizocoelomate
D. Nemathelminthes `rarr` pseudocoelmate

Answer

To determine which option is not correctly matched, we need to analyze the classifications of the mentioned animal phyla based on their body cavity types.

### Step-by-Step Solution:

1. **Identify the Types of Body Cavities**:
- **Acoelomate**: Animals that do not have a body cavity (e.g., Platyhelminthes).
- **Pseudocoelomate**: Animals that have a body cavity not lined by mesoderm (e.g., Nematoda).
- **Coelomate**: Animals that have a true body cavity lined by mesoderm, which can be further divided into:
- **Schizocoelomate**: Coelom arises from the splitting of mesoderm (e.g., Annelida, Mollusca).
- **Enterocoelomate**: Coelom arises from mesodermal pouches from the gut (e.g., Echinodermata, Chordata).

2. **Analyze Each Option**:
- **Annelida - Schizocoelomate**: Correctly matched. Annelids are indeed schizocoelomates.
- **Platyhelminthes - Acoelomate**: Correctly matched. Platyhelminthes are acoelomates.
- **Arthropoda - Schizocoelomate**: Correctly matched. Arthropods are schizocoelomates.
- **Nematoda - Pseudocoelomate**: Correctly matched. Nematodes are pseudocoelomates.

3. **Identify the Incorrect Match**:
- The incorrect match is **Annelida - Anterocelomate**. Annelida are not anterocelomates; they are classified as schizocoelomates.

### Conclusion:
The option that is not correctly matched is **Annelida - Anterocelomate**.