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
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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