Spirotrichea:
Stichotrichida: Urostylina: Urostylidae
Urostyla sp.
Ehrenberg, 1830
Family: Frontal cirri differ in size and/or pattern from ventral ones of files;
"collar" extends short distance along right edge of body; oral area not U-shaped
(Illustrated Guide, 1985).
Genus: With 2 or more right marginal files of cirri (Illustrated Guide, 1985).
Ellipsoid; flexible; posterior rounded;
flattened ventral surface with 4-10 rows of cirri; 2 marginal rows;
3 or more frontals; 5-12 anals (Kudo, 1966).
Ovoid to elongate with large number of ventral rows of cirri (files); transverse cirri present;
frontal cirri undifferentiated from ventrals
(Carey, 1992).
Species:
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Urostyla sp. (trichogaster ?),
cell body 238-245 μm long, 85 μm wide,
a cyst formation ?, x 100, x 400, Japan, 1998 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
U. trichogaster Stokes: 250-330 μm long;
ellipsoid, flexible; about 10 rows of ventrals; many frontals; 2 rows of marginals; 10 anals
(How to know the protozoa, 1979).
U. grandis Ehrenberg: 300-400 μm long;
macronucleus in 100 or more parts; 6-8 micronuclei (Kudo, 1966).
U. caudata Stokes: About 600 μm long;
narrowed anterior part bent to left; peristome 1/3 the body length; macronucleus many (Kudo, 1966).
U. polymicronucleata Merriman: 225 μm long,
65 μm wide;
3 large and 10 small frontals; 4 ventrals; macronucleus in two parts;
3-11 micronuclei (Kudo, 1966).
U. coei Turner: 200 μm long,
50 μm wide; 4 ventrals; 5 frontals;
macronucleus in two parts; 4 micronuclei (Kudo, 1966).
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