Which of the following annelids is a parasite on snails and frogs

Options

A. Acanthobdella
B. Pontobdella
C. Branchellion
D. Glossiphonia

Answer

To answer the question "Which of the following annelids is a parasite on snails and frogs?", we can follow these steps:

### Step 1: Understand the Question
The question is asking for a specific type of annelid that acts as a parasite on snails and frogs. We need to identify which annelid fits this description.

### Step 2: Recall Characteristics of Annelids
Annelids are segmented worms that belong to the phylum Annelida. They can be found in various habitats and can have different lifestyles, including parasitic forms.

### Step 3: Identify Parasitic Annelids
Among the annelids, leeches are known to be parasitic. They belong to the subclass Hirudinea within the phylum Annelida.

### Step 4: Focus on Specific Leeches
The question specifically mentions parasites on snails and frogs. One well-known genus of leeches that fits this description is **Hirudo**, which includes species that can parasitize various animals, including frogs and snails.

### Step 5: Confirm the Answer
Based on the information, the leech from the subclass Hirudinea, particularly the genus **Hirudo**, is a parasite that can feed on the blood of frogs and snails.

### Conclusion
The correct answer to the question is **Hirudo**, which is a genus of leeches that acts as a parasite on snails and frogs.

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