Genus: When extended, trumpet-shaped or cylindrical; highly contractile; some with mucilaginous lorica; conspicuous peristomal field frontal; contractile vacuole anterior-left; fresh water (Kudo, 1966).
Species: 0.5-1 mm long; anterior end expanded; body surface with groups of longer cilia; posterior portion drawn out and often within a gelatinous tube (lorica); macronucleus long band-form (Kudo, 1966). Body attenuated, peristome widely expanded, attains 0.5-1.0 mm; peristome has no central raised dome; somatic bristles present; gelatinous lorica; macronucleus moniliform but usually observed as a long rod; colourless (Carey, 1992).

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S. roeseli within lorica 1000 μm Japan, 1997	S. roeseli within lorica 1000 μm Japan, 1997	S. roeseli within lorica 1100 μm Japan, 1998	S. roeseli 1000 μm Tane-ike Togakushi highland Nagano, 2006
S. roeseli 800 μm Japan, 1998	S. roeseli 720 x 200 μm Iroha-numa 3 Zao mountain Yamagata, 2006	S. roeseli 1080 x 160 μm Azami-ike Norikura highland Nagano, 2006
S. roeseli 800 x 135 μm Okubo Ryoke Akigase park Saitama, 2005	S. roeseli 660 μm Saitama, 1999	S. roeseli ? 640 μm Asa-kawa Hachioji Tokyo, 2005	S. roeseli ? no bristles ? 660 μm Japan, 1997
S. roeseli ? no somatic bristles 640 μm Japan, 1998	S. roeseli ? no somatic bristles 640 μm Ishibashi Tochigi, 2004	S. roeseli within lorica 600 μm Japan, 1997	S. roeseli 580 μm Fujioka Tochigi, 2001
S. roeseli ? no bristles ? 560 μm Japan, 1997	S. roeseli within lorica 430 μm Japan, 1997	S. roeseli μm Japan, 1998 Movies	S. roeseli conjugating pairs 360 μm Japan, 1998 Movies
S. roeseli 400 μm Hiroshima, 1998 Movies	S. roeseli a dividing cell 370 μm Japan, 1999	S. roeseli ? bristles present 560 μm Chiba Park Chiba , 2003	S. roeseli bristles present μm Chiba Park Chiba, 2003
S. roeseli bristles present μm Zenko-ji Nagano, 2003	S. roeseli ? 360 x 100 μm Kitamoto nature o.p. Kitamoto Saitama, 2005	S. roeseli ? 400 x 100 μm Shirahata-Numa Urawa Saitama, 2005	S. roeseli ? 250, 300 x μm Jizoh-bori Sannoh Park Saitama, 2005
S. roeseli 400 x 100 μm near Dedono-yu Nishiwaga Iwate, 2007	S. roeseli μm near rice field Yachiyo Chiba, 2008

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