Form the following select the characteristic features that is not correct for Balanoglossus?

Options

A. Belongs to phylum that links non-chordates to chordates.
B. Excretory organ is proboscis gland.
C. Circulatory system is closed type.
D. Fertilisation is external.

Answer

To determine the characteristic feature that is not correct for Balanoglossus, we will analyze the provided options based on the known features of this organism.

### Step-by-Step Solution:

1. **Identify the Phylum**: Balanoglossus belongs to the phylum Hemichordata. This phylum is known to link non-chordates to chordates. Therefore, any statement claiming this is correct.

**Hint**: Remember the classification of Balanoglossus and its relationship with chordates.

2. **Excretory Organ**: The excretory organ of Balanoglossus is the proboscis gland. This is a well-established fact. Thus, any statement that mentions the proboscis gland as the excretory organ is also correct.

**Hint**: Think about the specific organs associated with excretion in different organisms.

3. **Circulatory System**: The circulatory system of Balanoglossus is of the open type. If any option states that the circulatory system is closed, that statement would be incorrect.

**Hint**: Recall the difference between open and closed circulatory systems in various organisms.

4. **Fertilization**: Balanoglossus exhibits external fertilization, which is a correct characteristic. Any statement claiming that fertilization is external is true.

**Hint**: Consider the reproductive strategies of marine organisms.

5. **Development**: The development of Balanoglossus is indirect, meaning it involves a larval stage. Any statement that mentions indirect development is also correct.

**Hint**: Understand the concept of direct vs. indirect development in the life cycles of organisms.

### Conclusion:
After analyzing all the statements, the incorrect characteristic feature for Balanoglossus is that its circulatory system is closed type. Therefore, the correct answer is:

**Option C: Circulatory system is closed type.**