Dorsal surface of Aphrodite is covered by
(a) Iridescent bristles
(b) Spines
(c) Elytra
(d) All the above

Options

A. Iridescent bristles
B. Spines
C. Elytra
D. All the above

Answer

To solve the question regarding what covers the dorsal surface of Aphrodite, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Organism**:
- Aphrodite, commonly known as the sea mouse, is a type of annelid belonging to the phylum Annelida.

2. **Identify the Dorsal Surface**:
- The dorsal surface refers to the back side of the organism.

3. **Examine the Options**:
- The options given are:
- (a) Iridescent bristles
- (b) Spines
- (c) Elytra
- (d) All the above

4. **Research the Characteristics of Aphrodite**:
- The dorsal surface of Aphrodite is known to be covered by calcareous scales. These scales are specifically referred to as "elytra."

5. **Evaluate Each Option**:
- **Option (a)**: Iridescent bristles - Not characteristic of the dorsal surface of Aphrodite.
- **Option (b)**: Spines - Also not present on the dorsal surface of Aphrodite.
- **Option (c)**: Elytra - Correct, as this is what covers the dorsal surface.
- **Option (d)**: All the above - Incorrect, since not all the options are correct.

6. **Conclusion**:
- The correct answer is (c) Elytra, as it is the only option that accurately describes what covers the dorsal surface of Aphrodite.

### Final Answer:
(c) Elytra