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

Options

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

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 Options**: The options provided are:
- A) Jointed appendages
- B) Chitinous exoskeleton
- C) Metameric segmentation
- D) Parapodia

2. **Evaluate Option A: Jointed Appendages**:
- Arthropods are characterized by having jointed appendages. This feature is essential for their locomotion and manipulation of the environment.
- **Conclusion**: This feature is present in Arthropoda.

3. **Evaluate Option B: Chitinous Exoskeleton**:
- Arthropods possess a chitinous exoskeleton, which provides protection and support. This exoskeleton is a defining characteristic of the phylum.
- **Conclusion**: This feature is present in Arthropoda.

4. **Evaluate Option C: Metameric Segmentation**:
- Metameric segmentation refers to the division of the body into segments. While arthropods do exhibit some degree of segmentation, it is not as pronounced as in annelids. However, they do have segmented bodies.
- **Conclusion**: This feature is present in Arthropoda.

5. **Evaluate Option D: Parapodia**:
- Parapodia are lateral extensions found in certain annelids, primarily for locomotion. This structure is not found in arthropods.
- **Conclusion**: This feature is NOT present in Arthropoda.

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