Genus: Like Peranema, but second flagellum free, trailing, 1/2 body length; plastic (How to know the protozoa, 1979). Both flagella emerge from canal; unequal in length and thickness; longer thicker one directed anteriorly during swimming; shorter trailing posteriorly, lying free from cell; colourless; phagotrophic; ingestion organelle composed of 2 rods; no eyespot; cell body plastic, solitary, elongated, tapering, not flattened; fresh and salt water (Illustrated Guide, 1985).

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H. acus cell 82 x 7.5 μm flag. μm Kayoicho-ike Fukuoka, 2001	H. acus cell 72 x 12 μm flag. 61 μm Japan, 199? Movies	H. acus cell 58 x 10 μm Futayo-no-ike Haguro mountain Yamagata, 2005	H. acus ? cell 41 x 5.5 μm flag. 27 μm Uruguay, 1999
H. acus ? cell 76 x 8 μm flag. 35 μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005	H. acus ? cell 88 μm flag. μm Kurihashi Saitama, 2001	H. acus ? cell 27 μm flag. μm Koshigaya Saitama, 2001	H. acus ? cell μm flag. μm Iwajuku Gunma, 2001
H. acus ? cell 52 x 3-14 μm Tanohara marsh Shiga highland Nagano, 2004	H. acus ? cell μm Iyari marsh 1 Omachi Nagano, 2007	Heteronema sp.? cell μm Kareki-numa Nikko Tochigi, 2008
Heteronema sp. cell 47 μm flag. μm Urawa Saitama, 1999	Heteronema sp. cell μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	Heteronema sp. cell μm Konpira bridge Shirakawa Fukushima, 2003	Heteronema sp. cell 65 x 11 μm Tanohara marsh Shiga highland Nagano, 2004

Similar Genus ->> Peranema; Distigma

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