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22 a. Lorica more or less flattened dorsoventrally, with 
      spines on anterior border and posterior corners. 
      Foot with 3 sections. Littoral among plants.

         Platyias.................................................48

22 b. Lorica oval to shell-shaped, often without spines, 
      or with short spines at anterior corner. Foot with 
      1 or more sections, and 1 or 2 long  toes............23

 

23 a. Lorica with flattened ventral surface, dorsal 
      surface convex. Foot with 2-3 sections. Most 
      species littoral, only planktonic species in 
      shallow lakes.

          Euchlanis (incl. Tripleuchlanis) and Dipleuchlanis...53

23 b. Lorica more or less flattened dorsally and 
      ventrally...........................................24

 

 

 

24 a. Lorica oval, pear- or shield-shaped. With dorsal 
      and ventral plate. Anterior opening of lorica broad. 
      Foot very short, toes long, eventually fused to one. 
      One eye. Littoral, tychoplanktonic i.e. migrated 
      from the littoral to the pelagic (or limnetic) 
      part of the lake.

          Lecane.........................................59

 

 

 

24 b. Lorica oval, egg- or pear-shaped, of 1 peace. 
      Anterior opening of lorica narrow, semicircular. 

      Foot opening deeply incised, foot with 3-4 
      sections. Two eyes. Littoral, tychoplanktonic.

          Lepadella......................................58

 

25 a. Lorica fairly stout. Posterior and anterior 
      corners of lorica with spines. Littoral, 
      tychoplanktonic.

          Mytilina............................................55

 

25 b. Lorica shell-shaped, rounded or truncated, 
      posteriorly rounded or extended into a point. 

      Littoral, tychoplanktonic.
         Colurella...........................................57

 

to 26 a.