Adaptation
Building portable cases to live in is a behavior shared among many types of Caddisfly larvae; Phryganeidae included. Because they have soft, vulnerable bodies, it is essential that they have protection. The larva use silk and plant material-such as twig and leaf fragments-to build cylindrical cases. Each species builds a different type of casing. Examples of different cases are shown below.
All Caddisflies have compound eyes, but Phryganeidae also have ocelli. Ocelli are simple eyes used to detect light and dark. These sensors are often used as behavioral determiners. Such as when organisms should be active, feed or hibernate.
The coloration (brown and grey
mottled) of these organisms
offers ultimate camouflage for their environments.