Which set of animals belongs to the same phylum?

Options

A. Hirudinaria and Laccifer
B. Pila and Loligo
C. Obelia and Euspongia
D. Ophiura and Salpa

Answer

To determine which set of animals belongs to the same phylum, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Animals in Each Option:**
- Option 1: Herudinaria and Lacifer
- Option 2: Pila and Loligo
- Option 3: Obelia and Euspongia
- Option 4: Ura and Salpa

2. **Determine the Phylum of Each Animal:**
- **Herudinaria**: This is a type of leech, which belongs to the phylum **Annelida**.
- **Lacifer**: This is a type of insect, which belongs to the phylum **Arthropoda**.
- **Pila**: This is a type of freshwater snail, which belongs to the phylum **Mollusca**.
- **Loligo**: This is a type of squid, which also belongs to the phylum **Mollusca**.
- **Obelia**: This is a colonial organism, which belongs to the phylum **Cnidaria**.
- **Euspongia**: This is a sponge, which belongs to the phylum **Porifera**.
- **Ura**: This is a type of sea cucumber, which belongs to the phylum **Echinodermata**.
- **Salpa**: This is a type of tunicate, which belongs to the phylum **Chordata**.

3. **Compare the Phyla:**
- From Option 1: Herudinaria (Annelida) and Lacifer (Arthropoda) - **Different Phyla**
- From Option 2: Pila (Mollusca) and Loligo (Mollusca) - **Same Phylum**
- From Option 3: Obelia (Cnidaria) and Euspongia (Porifera) - **Different Phyla**
- From Option 4: Ura (Echinodermata) and Salpa (Chordata) - **Different Phyla**

4. **Conclusion:**
- The only option where both animals belong to the same phylum is **Option 2: Pila and Loligo**, both of which belong to the phylum **Mollusca**.

### Final Answer:
**Option 2: Pila and Loligo belong to the same phylum (Mollusca).**

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