Which of the following following set of animals belong to phylum hemichordata?

Options

A. Balanoglossus, saccoglussus
B. Salpa, doliolum
C. Petromyzon, Myxine
D. Dentalium, chaetopleura

Explanation

To determine which set of animals belongs to the phylum Hemichordata, we can follow these steps:

### Step 1: Understand the Phylum Hemichordata
- Hemichordata is a phylum that includes worm-like organisms. They are primarily characterized by their body structure and habitat. Members of this phylum are often found in burrowing environments.

### Step 2: Analyze the Given Options
- The question provides several options, and we need to identify which of these options contains animals that belong to Hemichordata.

### Step 3: Evaluate Each Option
1. **Option 1: Balenoglossus and Saculoglossus**
- Balenoglossus is known as a corn worm and is a member of Hemichordata.
- Saculoglossus also belongs to Hemichordata.
- **Conclusion**: This option is correct as both organisms belong to Hemichordata.

2. **Option 2: Salpadiolium**
- Salpadiolium does not belong to Hemichordata.
- **Conclusion**: This option is incorrect.

3. **Option 3: Petromyzon and Myxine**
- Petromyzon (lampreys) and Myxine (hagfish) belong to the class Cyclostomata, which is not part of Hemichordata.
- **Conclusion**: This option is incorrect.

4. **Option 4: Dentelium and Ketoplura**
- Dentelium and Ketoplura belong to the phylum Mollusca.
- **Conclusion**: This option is incorrect.

### Step 4: Final Conclusion
- After evaluating all the options, the only correct set of animals that belong to the phylum Hemichordata is **Option 1: Balenoglossus and Saculoglossus**.