Subject: Pond Insect
Location: Oak Harbor (Whidbey Island), WA
June 15, 2012 2:26 pm
We started seeing these ”thatched cocoon” things floating in our pond in May. At first I thought they were worms but as they emerged their legs became visible. I’ve never seen anything like it! Any ideas?
Though it is commonly called a Caseworm, your observations that this Caddisfly Larva is not a true worm is correct. Aquatic larvae are usually called Naiads. This Caseworm will metamorphose into a winged Caddisfly, a mothlike insect. This is an awesome photo. Each species of Caddisfly makes a distinctive looking case because of both the form and the materials used. The case serves as a shelter during its larval stage.
Thank you soooo much!! Fascinating little creatures! I very much appreciate your time!