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Prostomatea: Prorodontida: Placidae

Cohn, 1866 (Spathidiopsis Fabre-Domergue, 1889;
Thoracophrya Kahl, 1926)

Kerona Genus: Body small; ellipsoid or ovoid; somewhat compressed; pellicle with conspicuous spiral furrows; cytostome a narrow slit at anterior extremity; with strong cilia on right margin of slit; macronucleus ellipsoid to sausage-form; contractile vacuole posterior (Kudo, 1966). Brosse dikinetids extend forward only to oral dikinetid (Illustrated Guide, 1985).

Placus sp. (or Caryotricha sp. ?), cell body 44 μm long, 25-28 μm wide, fresh water, x 400, Japan, 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Placus Placus Placus Placus Placus

P. socialis (Fabre-Domergue): 40-50 μm long; 28-32 μm wide; about 22 μm thick, salt water (Kudo, 1966).

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