|  Genus: Body long to ovoid; apex fan-shaped; txicysts evenly distributed along edge of apex (Illustrated Guide, 1985). 
Body elongate, circular in cross section; antrerior obliquely truncated, surmounted by an unciliated apical ridge, 
which is lined with trichocysts; cytostome slit-like (Carey, 1992).  
Very many species (Corliss, 1979). Species:
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