Genus: Elongate, ovoid; anterior apex often curves over the peristome; non contractile (Carey, 1992). In front of cytostome a two-layered undulating membrane on right edge; contractile vacuole and cytopyge terminal; rose-colored; many species (Kudo, 1966).

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B. americanum var. americanum μm Tokyo, 199?	B. americanum var. americanum μm Tokyo, 199?	B. americanum var. trinodatum μm Vermont-Maine USA, 1999	B. americanum var. trinodatum μm Vermont-Maine USA, 1999
B. japonicum 194 μm Japan, 19??	B. japonicum μm Japan, 19??	B. undulans 168 x 37 μm Japan, 199?	B. undulans μm Japan, 199?
B. seculum 110 x 32 μm Uruguay, 1999	B. seculum 110 x 32 μm Uruguay, 1999	B. seculum ? 125 x 39 μm Demaru-nakago Kawajima Saitama, 2005
B. lateritium 106 x 45 μm Tsukuba Ibaraki, 2000	B. lateritium 106 x 45 μm Tsukuba Ibaraki, 2000
B. lateritium 106 x 65 μm Tsukamoto Sakura-ku Saitama, 2004	B. lateritium 205 x 102 μm Kawaguchi n.p. Kawaguchi Saitama, 2006	B. lateritium 157 x μm Suijo Park Gyoda Saitama, 2006	B. lateritium ? μm Yoshikawa Saitama, 2003

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