Genus: Elongate, flattened; flexible, ribbon-like; anterior end neck-like and tip truncate; cytopharynx narrow, with trichocysts; two macronuclei; contractile terminal (Kudo, 1966). Apex a low dome, not ventrally bent; body much flattened (Illustrated Guide, 1985). Neck is truncated transversely and carries a short snout-like tip (Carey, 1992).

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Trachelophyllum sp. posterior tapered 300 x 65 μm Uruguay, 1999	Trachelophyllum sp. posterior rounded 276 x 60 μm Saitama, 1999	Trachelophyllum sp. posterior rounded 103 x 41 μm 197 x 13 μm Uruguay, 1999	Trachelophyllum sp. starved cell 126 x 10 μm Saitama, 1999
Trachelophyllum sp. 270 x 28 μm Saitama, 1999	Trachelophyllum sp. 145 x 22 μm Japan, 1998	Trachelophyllum sp. 130 x 20 μm near Town Hall Shobu town Saitama, 2004	Trachelophyllum sp. posterior tapered 172 x 40 μm Japan, 1998
Trachelophyllum sp. posterior tapered 157 x 41 μm Hanazono Saitama, 2001	Trachelophyllum sp. 157 x 25 μm Tsukuba Ibaraki, 2000	Trachelophyllum sp. 150 x 43 μm Hakama marsh Madarao highland Niigata, 2005	Trachelophyllum ? 280 x 64 μm Onnenai Kushiro marsh Hokkaido, 2005
Trachelophyllum sp. 45 x 12 μm Saitama, 1999	Trachelophyllum sp. μm Naruto Chiba, 2003	Trachelophyllum sp. posterior tapered 200 x 22 μm Nanbata-shinden Fujimi Saitama, 2004	Trachelophyllum sp. 284 x 58 μm Watarase Wetland Fujioka Tochigi, 2005
Trachelophyllum sp. 160 x 28 μm Okubo Ryoke Akigase park Saitama, 2005	Trachelophyllum ?? μm Iyari marsh Omachi Nagano, 2007

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