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Spirotrichea: Stichotrichida: Sporadotrichina: Oxytrichidae

Stylonychia mytilus
Ehrenberg, 1838

Suborder: Ventral cirri not as distinct files, except Gastrostyla.
Family: Frontoventral cirri scattered on forward, mid- and rear areas of ventrum.
Genus: Marginal cirri not confluent at rear; oral cavity wide, expansive; caudal cirri (usually 3) prominent (Illustrated Guide, 1985). Cell body ovoid to elongate, inflexible; large AZM supported anteriorly by a collar; two rows of marginal cirri not confluent posteriorly; strongly-developed frontoventral & transverse cirri present; three long, stiff caudal cilia; dorsal surface ornamented by short rows of cirri; two macronuclei; cyst stage recorded in some species (Carey, 1992).
8 (3 + 2 + 3) frontal, 5 ventral, 5 transverse, 3 caudal cirri.

Species: 100-300 μm long (Kudo, 1966). Elongate, anterior wider than posterior; up to 300 μm long; AZM 1/3 to 1/2 body length; distinctive 3 frontal and 3 long caudal cirri; two ovoid macronuclei (Carey, 1992).
Google Image Search
Stylonychia mytilus
S. mytilus
225 μm
posterior rounded
Saitama, 1999
Stylonychia mytilus
S. mytilus
175-200 x 88 μm
posterior truncated
Japan, 1998
Stylonychia mytilus
S. mytilus
163 μm
posterior truncated
Saitama, 1999
Stylonychia mytilus
S. mytilus
μm
posterior truncated
Ta river
Ishibashi
Tochigi, 2004
Stylonychia mytilus
S. mytilus
160 x 65 μm
Akebono marsh
Tsuchiyu-onsen
Fukushima, 2005
Stylonychia mytilus
S. mytilus
97 μm
posterior rounded
Saitama, 1999
Stylonychia mytilus
S. mytilus
144-200 μm
posterior pointed
Japan, 1998
Stylonychia mytilus
S. mytilus
153 x 63 μm
posterior pointed
Japan, 1998
Stylonychia mytilus
S. mytilus
μm
posterior pointed
USA, 1998
Stylonychia mytilus
S. mytilus
110 x 46 μm
Kiyasse-Hanyu
Hanyu
Saitama, 2006
Stylonychia mytilus
S. mytilus ?
119 x 44 μm
posterior rounded
lateral short cirri
Japan, 1998
Stylonychia mytilus
S. mytilus
145 x 55 μm
Koyama River
Honjo
Saitama, 2006

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Stylonychia mytilus Stylonychia mytilus
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