Spiral cleavage is found in

Options

A. Coelenteratea
B. Annelids
C. Echinodermata
D. Cephalopod Molluscs.

Answer

### Step-by-Step Solution:

1. **Understanding Spiral Cleavage**:
- Spiral cleavage is a type of embryonic development where the cells (blastomeres) divide in a spiral arrangement. This means that the upper tier of cells is positioned over the junctions of the lower tier of cells.

2. **Identifying Characteristics**:
- In spiral cleavage, the arrangement of cells is such that they form a spiral pattern around the embryo's axis. This is a characteristic feature of certain animal groups.

3. **Classification of Animals**:
- Animals that exhibit spiral cleavage are typically classified as protostomes. This group includes various phyla such as annelids (segmented worms), mollusks, and others.

4. **Evaluating the Options**:
- A. Cylintrate: This term does not refer to a specific group known for spiral cleavage.
- B. Enolate: This is not a recognized phylum or group in the context of spiral cleavage.
- C. Canodermata: This term seems to be a misspelling or misinterpretation and does not correspond to a known group exhibiting spiral cleavage.
- D. Cephalopod mollusk: Cephalopods, which are a class of mollusks, do exhibit spiral cleavage.

5. **Conclusion**:
- Based on the characteristics of spiral cleavage and the classification of animals, the correct answer is **D. Cephalopod mollusk**.