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).
Species: |
50 μm
100 μm
150 μm; x 400
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).