Suborder: Ventral cirri as 1 or more files of varied length; linear.
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).

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Amphisiella sp.1 100 μm; 5 t.c. c.v. mid-ventral posterior tapered Japan, 1999	Amphisiella sp.2 79 μm; 4.5 t.c. ? c.v. mid-ventral posterior tapered Saitama, 1999	Amphisiella sp.3 85 μm; 5 t.c. c.v. mid-ventral posterior rounded Japan, 1998, 99	Amphisiella sp.3 70-80 μm; 5 t.c. c.v. mid-ventral posterior rounded Japan, 1998
Amphisiella sp.3 75 x 20 μm; 5 t.c. c.v. mid-ventral Fujioka Gunma, 2004	Amphisiella sp.3 78 x 24 μm; 5 t.c. Tane-ike Togakushi highland Nagano, 2006	Amphisiella sp.3 66 μm; 5 t.c. c.v. mid-ventral posterior rounded Tochigi, 2001	Amphisiella sp. ?? μm; 4 t.c. c.v. mid-ventral posterior rounded Matsubushi Saitama, 2003
Amphisiella sp.4 78 μm; 6 t.c. c.v. posterior posterior tapered Japan, 1998
t.c. = transverse cirri; c.v. = contractile vacuole

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