Colloblasts are only in coelenterates/ctenophorans.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks whether coloblasts are found in coelenterates (now referred to as cnidarians) or ctenophorans.

2. **Defining Coloblasts**: Coloblasts are specialized cells that are primarily found in ctenophorans (phylum Ctenophora). They are not found in coelenterates (phylum Cnidaria).

3. **Function of Coloblasts**: Coloblasts serve a specific function in ctenophorans. They are used for capturing prey and defense. The structure of coloblasts includes granules, spiral filaments, and straight filaments.

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