The Three-tooth Triaenodes Caddisfly was described in 1938; it is known from populations in Alabama, Florida and Oklahoma, USA.

The Florida and Oklahoma populations appear to have been last seen in the middle 1930s, while the population in Alabama survived at least until 1991, when it was last surveyed; this species may in fact still be in existence, if so, however, its future expectations are rather bleak.

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edited: 17.05.2022