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Spirotrichea: Stichotrichia: Stichotrichida: Holostichidae

Balladyna sp.
Kowalewski, 1882

Balladyna Genus: Ellipsoid; frontals not well developed or lacking; one ventral and two marginal rows of cirri; long dorsal and lateral stiff cirri; fresh water (Kudo, 1966). Generally small, ovoid or elongate; peristome small, 1/3 of the body length; three (one ventral and two mariginal ?) longitudinal rows of ventral cirri and one row of long, thin cirri (=lateral stiff cirri) to right and left of the ventrals; no frontal cirri; a row of transverse cirri; two macronuclei (Carey, 1992).
Similar Genus ->> Holosticha; Amphisiella; Urostyla

Balladyna sp., a conjugating pair, cell body 44 μm long, 18 μm wide, lateral stiff cirri conspicuous, laterally not flexible, contractile vacuole mid-ventral, transverse cirri not extend beyond the posterior, x 400, Japan, November 1998, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Balladyna Balladyna Balladyna

B. elonagta Roux, 1901: 32-35 μm long, 11-12 μm wide; fresh water (Kudo, 1966). Small, sausage-shaped, 35 μm long; three rows of ventral cirri; two spherical macronuclei (Carey, 1992).
Oxytricha setigera: 50 μm long (How to know the protozoa, 1979).

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