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Oligohymenophorea: Hymenostoamtia: Scuticociliatida: Pleuronematina: Cyclidiidae

Cyclidium sp.
Müller, 1786

Cyclidium Genus: Small, 15-60 μm long; with a caudal cilium; on the right edge of peristome occurs a membrane which forms a pocket around cytostomal groove; contractile vacuole posterior (Kudo, 1966). Ovoid body with flattened anterior cap; long peristome with large, undulatory membrane, extended in feeding, one long caudal cilium (How to know the protozoa, 1979). No somatic cilia at the anterior apex; no cilia around the posterior where a single, long caudal cilium usually merges; buccal ciliature proportionally smaller in comparison to Pleuronema (Carey, 1992).
Similar Genus ->> Uronema; Pleuronema

Cyclidium glaucoma (or Cristigera setosa ?), cell body μm long, μm wide, x 640, Wakamiya Park, Matto city, Ishikawa Pref., Japan, September 2002, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cyclidium Cyclidium Cyclidium

* Cyclidium glaucoma Müller, 1786: Cell body ovoid with flattened anterior cap, 25-30 μm long; long peristome, with large undulating membrane; long cilia in rows; one long caudal cilium; moves by jumping or darting (How to know the protozoa, 1979). Cell body ovoid, 14-23 μm long, 6-12 μm wide; 10 longitudinal ciliary rows, each row with 10-20 cilia; peristome from apical end to mid-ventral with conspicuous undulating membrane (velum) at its right side; a macronucleus spherical, located anteriorly, with a single micronucleus (Gensei-Doubutu Zukan, 1981). Ovoid, 30 μm long; peristome 1/2 the body length; anterior with a small domed area; a single caudal cilium (Carey, 1992).

Cyclidium candens Kahl, 1928: Ovoid but elongate, 35-40 μm long; with longitudinal ridges in the pellicle; buccal apparatus 1/3 body length; a single very long caudal cilium (Carey, 1992).

Cyclidium citrullus (Cohn, 1866) Kahl, 1931: Ovoid, both anterior and posterior form small bump; 30 μm long; buccal ciliature 1/2 body length; a single caudal cilium; a spherical macronucleus; a contractile vacuole (Carey, 1992).

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