In phylum echinodermata, the classes having pedicellariae are

Options

A. Crinoidea and holothuroida
B. Holothuroidea and echinoidea
C. Asteroidea and echinoidea
D. Ophiuroidea and holothuroidea.

Answer

To answer the question regarding which classes in the phylum Echinodermata have pedicellariae, we can analyze the options provided and the characteristics of each class.

### Step-by-Step Solution:

1. **Understand Pedicellariae**:
- Pedicellariae are small pincer-like structures found on the surface of some echinoderms. They serve various functions, including defense and cleaning.

2. **Review the Classes of Echinodermata**:
- The main classes in the phylum Echinodermata include:
- Asteroidea (sea stars)
- Echinoidea (sea urchins and sand dollars)
- Holothuroidea (sea cucumbers)
- Ophiuroidea (brittle stars)
- Crinoidea (sea lilies and feather stars)

3. **Analyze Each Option**:
- **Option 1: Crinoidea and Holothuroidea**:
- Crinoidea do have pedicellariae, but Holothuroidea do not. Therefore, this option is incorrect.
- **Option 2: Holothuroidea and Echinoidea**:
- Holothuroidea lacks pedicellariae, while Echinoidea does have them. This option is also incorrect.
- **Option 3: Asteroidea and Echinoidea**:
- Both Asteroidea and Echinoidea possess pedicellariae. This option is correct.
- **Option 4: Ophiuroidea and Holothuroidea**:
- Ophiuroidea lacks pedicellariae, and Holothuroidea also lacks them. This option is incorrect.

4. **Conclusion**:
- The classes in the phylum Echinodermata that have pedicellariae are **Asteroidea and Echinoidea**.

### Final Answer:
The classes having pedicellariae in phylum Echinodermata are **Asteroidea and Echinoidea**.

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