Which of the following is NOT a characteristic of caddisflies?

The body shape of caddisflies is typically not long and narrow; rather, their design can vary and is often characterized by a more robust, cylindrical shape. Caddisflies are indeed known for their distinctive features, which include hooked prolegs at the end of the abdomen that help them cling to substrates. Additionally, many caddisflies are known to be builders, constructing cases or tubes from natural materials like silk, which provides them with both camouflage and protection. Gills, whether singular or double, are also a common characteristic on the abdomen of many species within this order, aiding in respiration while residing in aquatic environments. Thus, the assertion that caddisflies have a long and narrow body shape does not align with their typical morphological characteristics.