California Department of Fish and Wildlife
Aquatic Biological Assement

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Ameletidae Level 1 Level 2

Ameletidae

 

Key Characters

Labrum with a median notch on distal margin, terminal filament subequal to cerci. Antennae usually shorter than width of head, maxillae with crown of pectinate spines. Abdominal gills with single oval lamella with a sclerotized band along lateral margin and usually with a similar band on or near mesal margin.
Tolerance 0
Distribution CA, OR, WA, NV, AZ