Which of the following features is not present in the phylum Arthropoda

Options

A. Chitinous exoskeleton
B. Metameric segmentation
C. Parapodia
D. Jointed appendages

Answer

To determine which feature is not present in the phylum Arthropoda, we will analyze each of the given options one by one.

### Step-by-Step Solution:

1. **Identify the Features of Arthropoda**:
- The phylum Arthropoda is known for certain key characteristics. These include a chitinous exoskeleton, jointed appendages, and metameric segmentation.

2. **Evaluate the First Option: Chitinous Exoskeleton**:
- Arthropods possess a chitinous exoskeleton that provides protection and support. This feature is indeed present in Arthropoda.
- **Conclusion**: This option is not the answer.

3. **Evaluate the Second Option: Metameric Segmentation**:
- Metameric segmentation refers to the division of the body into repeated segments. While arthropods do exhibit segmentation, it is not as pronounced as in annelids. However, it is still a characteristic of arthropods.
- **Conclusion**: This option is not the answer.

4. **Evaluate the Third Option: Parapodia**:
- Parapodia are fleshy, paired appendages found in annelids, not arthropods. They are used for locomotion and are not a feature of arthropods.
- **Conclusion**: This option is the answer as it is not a feature of Arthropoda.

5. **Evaluate the Fourth Option: Jointed Appendages**:
- Arthropods are characterized by jointed appendages, which are crucial for their movement and various functions. This feature is definitely present in arthropods.
- **Conclusion**: This option is not the answer.

### Final Answer:
The feature that is not present in the phylum Arthropoda is **Parapodia**.

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