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 legs

 

Six legs
One pair of legs on each segment of the thorax (6 legs total). Includes most insect larvae, insect adults and collembola (springtails).

  CollembolaSialidaeCoenagrionidae
       

 

 Crustacea
Five or more pairs of legs (10 or more legs total). Includes scuds, sowbugs, crayfish, tadpole shrimp and seed shrimp. Some legs are highly modified; some organisms have a shell-like carapace that may hide legs.		  
       
 

Hydracarina
(water mites)
Four pairs of legs (8 legs total); small, round, may be colorful.

 
       
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