Conservation Status

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

WHEN IS A FLY NOT A FLY?

The common names for true flies (Diptera), such as bee fly, crane fly, fruit fly, hover fly, house fly, and robber fly, always have two words. But insects that are not dipterans have common names that are written as one word, like butterfly (Lep-idoptera), caddisfly (Trichoptera), dobsonfly (Megaloptera), dragonfly and damselfly (Odonata), mayfly (Ephemeroptera), sawfly (Hymenoptera), scorpionfly (Mecoptera), snakefly (Raphidioptera), and stonefly (Plecoptera).

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.

Triaenodes bicolor
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