Family: Small, less than 50 μm; oblong to ovate; ridges faint or absent.
Genus: Body ovate in locomotion, longer than broad, with clear zone as anterior part; uninucleate (Illustrated Guide, 1985).

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Longer than broad
Clydonella sp.2 16 x 14 μm Japan, 1998	Clydonella sp.1 15 x 11 μm Japan, 1998	C. vivax 11-12 x 10 μm Japan, 1998	C. vivax 9-13 x 11-13 μm Japan, 1999
Clydonella ?? 12 x 9 μm Japan, 1998
Broader than long
Clydonella sp.4 19-20 x 24 μm or Vannella ? Japan, 1998	Clydonella sp.5=4 12 x 14 μm or Vannella ? Japan, 1998	Clydonella sp.5=4 15 x 18 μm or Vannella ? Tachikawa Tokyo, 2004
Clydonella sp.6 8 x 8 μm Japan, 1998	Clydonella sp. μm Tsuchiura Ibaraki, 2002	Clydonella sp. 15 x 17 μm Kurome river Asaka Saitama, 2005

Similar Genus -->> Vannella

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