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Hydroptilidae Level 1 Level 2
Small size, usually < 6mm ("microcaddisflies"). Thoracic segments with dorsal, sclerotized plates. Most larvae construct portable, purse-like cases (final instar). Many feed on filamentous algae (piercers). Undergo hypermetamorphosis: free-living during first four instars.
|Tolerance||generally 3-6, may be as high as 8 in some genera (Agraylea)|
|Distribution||CA, OR, WA, NV, AZ|