Pronunciation: [kˈadɪsflˌa͡ɪz] (IPA) 
The word "caddisflies" is spelled with a double "d" and double "s" because it is derived from the word "caddis," which is a type of insect that builds a protective case around itself. In IPA phonetic transcription, the word is pronounced /ˈkædɪsflaɪz/, with the stress on the first syllable. The "a" is pronounced as the short "a" sound, the "dd" and "ss" are pronounced separately, and the final "es" is pronounced as "iz."
Caddisflies, also known as Trichoptera, are insects belonging to the order Trichoptera, characterized by their moth-like appearance. The name "caddisflies" is derived from the Old English word "caddesse," which means "woolly worms." These insects are typically small and can be found worldwide, inhabiting freshwater environments such as streams, rivers, lakes, and ponds.
Caddisflies undergo a complete metamorphosis, passing through four distinct life stages: egg, larva, pupa, and adult. The larvae, which are the aquatic stage of caddisflies, are known for constructing protective cases using various materials found in their surrounding environment. These cases are built from silk secretions produced by the larvae and can be made of sand, stones, vegetation, or even bits of debris.
The larvae of caddisflies play a vital role in aquatic ecosystems as they are good indicators of water quality. Their presence in high numbers suggests clean and unpolluted water, while their absence or decline may indicate pollution and degradation. Additionally, caddisfly larvae are an important food source for many other aquatic organisms, including fish, amphibians, and birds.
Once they complete their development, caddisflies emerge from the water as adult insects. The adult caddisflies resemble small moths and have two pairs of membranous wings covered in fine hairs. They are primarily active during the evening and nighttime, and their lifespan is relatively short, lasting only a few weeks.
In summary, caddisflies are small, moth-like insects found in freshwater habitats. They undergo multiple life stages, with the larvae constructing protective cases made from various materials. Caddisflies are indicators of water quality and serve as a significant food
The word caddisflies is derived from the Middle English term caddys, which was used to refer to a small roundish lump or heap. This term was further influenced by the Old French word cadoche, meaning a tuft or pad. Eventually, the word caddis emerged in English to describe a kind of coarse woolen cloth, often resembling the shape of a caterpillar's body. Since the larvae of caddisflies construct protective cases using various materials, such as silk and small pebbles, the insects came to be known as caddis-flies due to their resemblance to the fabric. Over time, the term was modified to become caddisflies.
