Cylindrical bodies, worm-like marine animals belong to the phylum:

Options

A. Echinodermata
B. Mollusca
C. Coelenterata
D. hemichordata

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about cylindrical bodies and worm-like marine animals, and we need to identify the correct phylum they belong to from the options provided: Echinodermata, Mollusca, Salientrata, or Hemichordata.

2. **Analyzing the Options**:
- **Echinodermata**: This phylum includes starfish and sea urchins, which do not have cylindrical, worm-like bodies.
- **Mollusca**: This phylum includes animals like snails and octopuses, which also do not fit the description of cylindrical, worm-like bodies.
- **Salientrata**: This phylum includes amphibians, which are not marine and do not have worm-like bodies.
- **Hemichordata**: This phylum includes worm-like marine animals, which are characterized by their cylindrical bodies.

3. **Identifying the Correct Phylum**: Based on the analysis, the only phylum that includes cylindrical, worm-like marine animals is **Hemichordata**.

4. **Examples and Classes**:
- Hemichordata is divided into two classes:
- **Pterobranchia**
- **Enteropneusta**
- An example of an animal in this phylum is the **Econ Worm**, which belongs to the class Enteropneusta.

5. **Conclusion**: Therefore, the correct answer to the question is **Hemichordata**.

---