In Arthropoda, head and thorax are often fused to form cepalothrax, but one of the following classes is the body divide into head, thorax and abdomen

Options

A. Myriapoda
B. Crustacea
C. Arachnida and Crustacea
D. Insecta

Answer

To solve the question regarding the classification of Arthropoda, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which class of Arthropoda has a body divided into three distinct parts: head, thorax, and abdomen.

2. **Identify Key Terms**:
- **Arthropoda**: A phylum that includes invertebrates with jointed limbs and an exoskeleton.
- **Cephalothorax**: A body structure where the head and thorax are fused together, commonly found in some classes of Arthropoda.

3. **Analyze the Options**:
- **A. Myriapoda**: This class includes centipedes and millipedes, which have a head and a long segmented body but do not have a distinct thorax and abdomen.
- **B. Crustacea**: This class includes crabs and lobsters, which typically have a cephalothorax.
- **C. Arachnida**: This class includes spiders and scorpions, which also have a fused cephalothorax and abdomen.
- **D. Insecta**: This class includes insects, which have a distinct head, thorax, and abdomen.

4. **Determine the Correct Answer**:
- Among the options, **Insecta (Option D)** is the only class where the body is divided into three separate parts: head, thorax, and abdomen.

5. **Conclusion**: The correct answer to the question is **Option D: Insecta**.