Its larva builds a protective case out of sand, twigs and shell, so the caddisfly is read as making a shelter from whatever is at hand.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.