California Department of Fish and Wildlife
Aquatic Biological Assement

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Baetidae Level 1 Level 2

Baetidae

 

Key Characters

Labrum with a median notch on distal margin (in Nearctic, only absent in Apobaetis), terminal filament variable, may be shorter than tergum 10 or subequal to cerci. Antennae variable, can be 2-3 times or more than the width of the head, or shorter than width of head. Maxillae without pectinate spines, abdominal gills variable.
Tolerance
Variable, from 2-9
Distribution
CA, OR, WA, NV, AZ, Baja