Definition: The term "fenestellidae" refers to a group of insects known for their ability to construct and maintain hollow, often decorative, structures. These insects are characterized by their unique, highly intricate body plans that allow them to create various forms such as windows, doors, and other openings. Fenestellids are typically found in different environments including trees, shrubs, and flowers. They also play a crucial role in the growth of plants, aiding in the development of new structures and processes