The pluteus larva of echinodermata belong to the class (es)

Options

A. Ophiuroidea
B. Echinoidea
C. Asteroidea
D. Both 1 and 2

Answer

### Step-by-Step Solution:

1. **Understanding Pluteus Larva**:
- The Pluteus larva is a type of larval stage found in certain echinoderms. It is important to identify which classes of Echinodermata exhibit this larval form.

2. **Identifying Characteristics of Pluteus Larva**:
- The Pluteus larva is characterized by bilateral symmetry, transparency, and the presence of a calcareous skeleton with spines. These features help in identifying the classes of echinoderms that possess this larval stage.

3. **Classes of Echinodermata**:
- Echinodermata is divided into several classes. The relevant classes for Pluteus larvae are:
- **Ophiuroidea**: Known for brittle stars and basket stars.
- **Echinoidea**: Known for sea urchins and sand dollars.
- **Asteroidea**: Known for sea stars, which have a different larval form called Bipinnaria.

4. **Conclusion**:
- Based on the characteristics of the Pluteus larva, it can be concluded that the Pluteus larva belongs to the classes **Ophiuroidea** and **Echinoidea**. Therefore, the correct answer to the question is that Pluteus larvae belong to the classes Ophiuroidea and Echinoidea.

### Final Answer:
The Pluteus larva of Echinodermata belongs to the classes **Ophiuroidea and Echinoidea**.

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