Which of the following is not related with Echinodermata?

Options

A. Madreporite
B. Parapodia
C. Marine habitat
D. Autotomy

Answer

To determine which of the following is not related to Echinodermata, we will analyze each option provided.

1. **Circulatory System of Echinodermata**:
- Echinoderms possess a unique water vascular system that functions in locomotion, feeding, and gas exchange. This system is crucial for their physiology and is indeed related to Echinodermata.

2. **Parapodia**:
- Parapodia are paired, lateral extensions found in annelids (segmented worms) and are not a characteristic of Echinodermata. Therefore, this option is not related to Echinodermata.

3. **Marine Habitat**:
- Echinoderms, such as starfish, sea urchins, and sea cucumbers, are primarily marine organisms. This option is related to Echinodermata.

4. **Autotomy**:
- Autotomy refers to the ability of an organism to shed a part of its body, which is a behavior observed in many echinoderms, like starfish, when they lose an arm to escape predators. This option is also related to Echinodermata.

Based on the analysis, the correct answer is **Parapodia**, as it is not related to Echinodermata.

### Step-by-Step Solution:
1. Identify the characteristics of Echinodermata.
2. Evaluate each option given in the question.
3. Confirm that the circulatory system is related to Echinodermata.
4. Recognize that parapodia are a feature of annelids, not echinoderms.
5. Acknowledge that marine habitat is a characteristic of echinoderms.
6. Understand that autotomy is a behavior seen in echinoderms.
7. Conclude that the correct answer is **Parapodia**.