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19 a. Lorica not flattened, asymmetrical, more or less 
      cylindrical. Foot short with toes of unequal length, 
      often with one toe almost reduced or absent. Most 
      species littoral.
          Trichocerca..................................................60

19 b. Lorica vase-shaped, longer than broad..........................56 

 

19 c. Lorica flattened dorsoventrally................................22

20 a. Foot wrinkled, wormlike, long flexible and retractile. 
      Lorica more or less flattened dorsoventrally, with 
      2, 4 or 6 anterior spines and with posterior rounded 
      or with 2 or 4 spines.
         Brachionus...................................................35

 

20 b. Foot not wrinkled, 1-4 sections..................................21

 

21 a. Brachionus-like. Foot long, with 3 sections. 
      Lorica granulated, with 6 anterior spines.

Plationus.....................................................47

21 b. Foot short, not fully retractile..................................22

 

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