Key to Aquatic Macroinvertebrates in Utah - 1 or 2 Tails

Organisms with 3 Pairs of Legs and 1 or 2 Tails

1. Organism has 2 tails, thoracic gills may be present. 

2. Organism may be found in a case made of rock, sand, plant material, etc.; has an elongated abdomen.

3.Organism has lateral filaments on abdominal segments. 

4.Organism has well-defined head capsule and thoracic plates. 

5. Organism with 2 tails, well-defined abdominal gills. 

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