Ctenolepisma longicaudata, commonly known as the silverfish, is a small insect belonging to the order Zygentoma. It is characterized by its elongated body, measuring about 1-2 centimeters in length, and its silver-gray coloration. Silverfish are nocturnal and prefer dark and damp environments, such as basements and bathrooms. They feed on a variety of organic materials, including paper, glue, and starchy substances.