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Spirotrichea: Stichotrichia: Stichotrichina: Amphisiellidae

 Amphisiella sp.
Gourret and Roeser, 1888

Amphisiella Family: Cirri in 2 marginal, 1 frontoventral files; cirral files straight; more than 1 frontoventral file extends past middle of body (Illustrated Guide, 1985).
Genus: Elongate, some species with a pronouced head region; body often twistes and flexes during locomotion; three rows of ventral cirri (2 rows of marginal cirri, 1 row of ventral cirri from Curds, 1982); frontal & V-shaped transverse cirri; transverse cirri may be very long extending beyond the posterior (Carey, 1992).
Species:
Similar Genus ->> Holosticha; Balladyna; Urostyla

Amphisiella sp. (thiophaga or similar species ?), cell body 75 μm long, 20 μm wide, L/W=3.8, 5 caudal cirri present, x 640, a stream near Seseragi park, Karasu-gawa-ryokuchi (riverside green land near Karasu river), Fujioka city, Gunma Pref., Japan, December 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Amphisiella Amphisiella Amphisiella

A. thiophaga (Kahl, 1928) Kahl, 1930-5: Elongate; 100 μm long; AZM 1/3 of the body length; transverse cirri project beyond the posterior; only 5 frontal cirri; two ovoid macronuclei; lateral stiff cirri absent (?) (Carey, 1992).

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