THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION

Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands
An Identification Guide and Educational Resource
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  Identify taxaJointed legsCrustaceaAmphipodaUncommon in wetlands
       
 

Anisogammaridae
First pair of antennae longer than the second;
very similar to Gammarus (eyes present; extra filament with several segments on antennae; hind end with deep indentation); however, the tiny spines on top of the last 3 segments are in two bunches of 4 (one bunch on either side)

  
       
  Stygobromus (family Crangonyctidae)
First pair of antennae longer than second; eyes never present; the extra filament near the base of the first pair of antennae is never more than 2 segments; the plate on the hind end is either not indented at all or only has a shallow indentation at the end		  
       
 
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