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Prostomatea: Prostomatida: Metacystidae

Metacystis sp.
Cohn, 1866

Metacystis Genus: Oblong; ciliary circle around cytostome; usually one caudal cilium; with large posterior vesicle containing turbid fluid (Kudo, 1966). Easily recognizable by the transverse annulations of the body and the presence of a large protruding vacuole in posterior (Carey, 1992). Similar to Vasicola, but small and free swimming, without a lorica (How to know the protozoa, 1979).
Similar Genus ->> Vasicola

Metacystis lagenula ?, cell body 42 μm long, 13 μm wide, 9 furrow rings, x 400, x 640, Japan, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Metacystis Metacystis Metacystis Metacystis Metacystis Metacystis

M. truncata Cohn, 1866: Elongate; with about twelve furrow rings; up to 30 μm long (Kudo, 1966).
M. elongata Kahl, 1928: Cylindrical; 60-80 μm long; a single long caudal cilium; lorica not known (Carey, 1992).
M. recurva Penard, 1922: Vermiform or cylindrical, with posterior expanded; up to 68 μm long; body annulated, curved; a rigid, slender and colourless lorica; large posterior vacuole with a single caudal cilium; spherical macronucleus central; contractile posterior (Carey, 1992).

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