Four species of caddisflies are listed as Extinct by the World Conservation Union (IUCN). These four species no longer exist. All caddisflies are vulnerable to changes in water quality. Since many species are found only in a small region, the slightest disturbance in their environment may have a devastating effect on the entire population. Because of their sensitivity to water pollution, the presence or absence of caddisfly larvae is used as an indicator of water quality.
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