In oocytes of some vertebrates, diplotene lasts for months or years. It is called

Answer

To solve the question, we need to identify the specific term used to describe the prolonged resting stage of oocytes in certain vertebrates during the diplotene phase of meiosis.

### Step-by-Step Solution:

1. **Understand the Context**: The question refers to the diplotene stage of oocytes in some vertebrates, where this stage can last for an extended period, sometimes months or years.

2. **Identify the Stages of Meiosis**: In meiosis, particularly during prophase I, there are several stages: leptotene, zygotene, pachytene, and diplotene. Each of these stages has distinct characteristics.

3. **Focus on Diplotene**: The diplotene stage is known for its prolonged duration in certain vertebrates. It is during this stage that the chromosomes become visible and start to separate, but the oocyte may remain in this stage for a long time.

4. **Recognize the Correct Term**: The prolonged resting stage of the diplotene phase in oocytes is specifically referred to as the "Dictyotene stage." This is a well-known term in the study of oocyte development.

5. **Select the Answer**: Based on the understanding that the prolonged resting phase during diplotene is called the Dictyotene stage, we conclude that the answer to the question is "Dictyotene stage."

### Final Answer:
The prolonged resting stage of diplotene in oocytes of some vertebrates is called the **Dictyotene stage**.