One of the following excluded from deuterostomes

Options

A. Chordate
B. Echinodermata
C. Annelida
D. Cephalochordata

Answer

To determine which of the following options is excluded from deuterostomes, we will analyze each option based on their classification in the animal kingdom.

### Step 1: Understand the Definition of Deuterostomes
Deuterostomes are a group of animals characterized by their embryonic development. In deuterostomes, the first opening that forms during embryonic development, known as the blastopore, becomes the anus, while the mouth forms secondarily.

### Step 2: Analyze Each Option
1. **Caudata**: This group includes vertebrates such as salamanders and is classified as deuterostomes.
2. **Echinodermata**: This phylum includes starfish and sea urchins, which are also classified as deuterostomes.
3. **Annelida**: This phylum includes segmented worms like earthworms and leeches. Annelids are classified as protostomes, where the blastopore becomes the mouth.
4. **Cephalocaudata**: This group includes certain primitive chordates, which are also classified as deuterostomes.

### Step 3: Identify the Excluded Group
From the analysis, we see that:
- Caudata, Echinodermata, and Cephalocaudata are all deuterostomes.
- Annelida is the only group that is classified as protostomes.

### Conclusion
Thus, the group that is excluded from deuterostomes is **Annelida**.

### Final Answer
**Annelida** is excluded from deuterostomes.

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