Which of the following characters stand true for Antedon ?

Options

A. Spiny-bodied and organ level of organisation
B. Mouth on the dorsal side and anus on the ventral side
C. Exclusively marine and triploblastic
D. Has a pseudocoelom

Answer

To determine the correct characters that stand true for Antedon, we will analyze each statement provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the Organism**:
- Antedon is also known as Crinoid. It belongs to the phylum Echinodermata.

**Hint**: Remember that Antedon is a type of echinoderm, which helps in identifying its basic characteristics.

2. **Evaluate the First Statement**:
- The first statement claims that Antedon has a "spiny bodied and organ level of organization."
- Echinoderms, including Antedon, do have spiny bodies, but they exhibit a true organ system level of organization, not just organ level.

**Conclusion**: This statement is **incorrect**.

**Hint**: Recall that echinoderms are characterized by their spiny skin and complex organ systems.

3. **Evaluate the Second Statement**:
- The second statement claims that Antedon has its mouth on the dorsal side and anus on the ventral side.
- In fact, in echinoderms, the mouth is located on the ventral side, and the anus is on the dorsal side.

**Conclusion**: This statement is also **incorrect**.

**Hint**: Visualize the orientation of echinoderms to remember the positions of the mouth and anus.

4. **Evaluate the Third Statement**:
- The third statement claims that Antedon is "exclusively marine and triploblastic."
- Antedon is indeed exclusively marine and is triploblastic, meaning it has three germ layers: ectoderm, mesoderm, and endoderm.

**Conclusion**: This statement is **correct**.

**Hint**: Remember that all echinoderms are marine organisms and have a complex embryonic structure.

5. **Evaluate the Fourth Statement**:
- The fourth statement claims that Antedon has a "pseudocoelom."
- Echinoderms, including Antedon, possess a true coelom, not a pseudocoelom.

**Conclusion**: This statement is **incorrect**.

**Hint**: Differentiate between true coelom and pseudocoelom to understand the body structure of echinoderms.

### Final Conclusion:
Based on the evaluations:
- The only true statement regarding Antedon is that it is exclusively marine and triploblastic. Therefore, the correct answer is **option 3**.