What features make a cucurbit fruit a pepo?

In the context of the Cucurbitales order, the fruit characteristic of the Cucurbitaceae family is known as a pepo.1

A pepo is defined by the following botanical features:

• Fleshy structure: It is a type of fleshy berry that remains indehiscent, meaning it does not open to release its seeds upon maturity.21
• Rind: The fruit possesses a tough, hard rind that protects the interior.21
• Seed content: It is a one-celled, many-seeded fruit.21
• Size: These fruits are often capable of attaining a considerable size.1

Common examples of plants that produce this type of fruit include pumpkins, squashes, melons, and cucumbers.21