Family: Apical cytostome eccentric, oral dikinetids along extended flailing anterior end ("proboscis"); toxicysts on ventrum of proboscis.
Genus: Body oval to round, rear rounded; 1 proboscis (Illustrated Guide, 1985). Round cytostome at base of neck; contractile vacuoles many (Kudo, 1966).

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T. ovum 362 x 180 μm Japan, 1998	T. ovum 260 x 150 μm Numa-no-hara m. Madarao highland Niigata, 2005	T. ovum 256 x 216 μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	T. ovum ? 225 x 85 μm Japan, 1997
T. subtilis 180 x 85 μm two Mac.? Kamifukuoka Saitama, 1999	T. subtilis 162 x 72 μm Namegawa Saitama, 1998	T. subtilis cell μm Japan, 1998	Trachelius sp. 155 x 123 μm two Mac. Matsumoto Nagano, 2001

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