Which group of protochordates contains Balanoglossus

Options

A. Urochordata
B. Tunicata
C. Cephalochordata
D. Hemichordata

Answer

To answer the question "Which group of protochordates contains Balanoglossus?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Protochordates**: Protochordates are the earliest members of the phylum Chordata. They are divided into three main subphyla: Urochordata, Cephalochordata, and Hemichordata.

2. **Identify the Groups**:
- **Urochordata**: This group includes organisms that have a notochord only in the tail region during their larval stage. An example is the tunicates.
- **Cephalochordata**: In this group, the notochord extends into the head region. An example is the lancelets.
- **Hemichordata**: This group is considered a connecting link between chordates and non-chordates. It includes organisms that exhibit some features of both groups.

3. **Locate Balanoglossus**: Balanoglossus is a genus of hemichordates. It is specifically classified under the phylum Hemichordata.

4. **Conclusion**: Since Balanoglossus belongs to the phylum Hemichordata, the correct answer to the question is that Balanoglossus is found in the group Hemichordata.

### Final Answer:
Balanoglossus is found in the group **Hemichordata**.

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