Family: Apex somewhat to much fan-shaped; oral region along apex, may extend ventrally (Illustrated Guide, 1985). Cytostome slit-like, situated apically on non-ciliated ridge of the body (Carey, 1992).
Genus: Cell body ovoid or cylindrical; oral ridge turns right-spirally down to posterior end (Kudo, 1966). Oral region spirals around body from anterior to posterior end (Illustrated Guide, 1985).

->> Description at WPRNO

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P. ovum 64 x 42 μm Kawafuji Yoshikawa Saitama, 2003

P. ovum 90 x 52 μm Kamisato Konosu Saitama, 2003

P. ovum 62 x 40 μm Takimamuro Konosu Saitama, 2005

P. ovum 70 x 47 μm Kitamoto n.o.p. Kitamoto Saitama, 2006

Similar genus -->> Bryophyllum; Spathidium;

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