Family: Apical cytostome eccentric, oral dikinetids along extended flailing anterior end ("proboscis"); toxicysts on ventrum of proboscis.
Genus: Body long, rear usually pointed (Illustrated Guide, 1985). Elogate; snout or neck-like prolongation (proboscis) conspicuous; contractile vacuoles two or more (Kudo, 1966). Contractile vacuoles usually lie in a row along the dorsal surface (Carey, 1992).

->> Description at WPRNO

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Proboscis longer than half of the body length
D. cygnus 600 μm Japan, 1998	D. cygnus 680 x 50 μm Muneoka Shiki Saitama, 2004	D. cygnus 560 x 45 μm Seseragi marsh Shiga highland Nagano, 2004	D. cygnus 680 x 48 μm Imori pond Myoko highland Niigata, 2004
D. amphileptoides ? 950 μm Saitama, 1999	D. amphileptoides ? 420 x 50 μm Tane-ike Togakushi highland Nagano, 2006	D. amphileptoides ? 985 μm, x 100 Akigase Park Saitama, 2002	D. amphileptoides ? μm, x 100 Sakado Saitama, 2003
Proboscis shorter (1/2 - 1/3) than half of the body length
Dileptus sp. 1400 μm Prob. 1/3 tail present Saitama, 1999	D. anser 445 μm, x 200 Prob. 1/3 tail present Fukushima, 1999	D. anser 275 μm, x 200 Prob. 1/3 tail present Japan, 1997	D. anser ? 181 μm, x 400 Prob. 1/3 ? Gunma, 2001
D. anser ? μm Ishibashi Tochigi, 2004	D. anser 230 x 44 μm 250 x 30 μm near Town Hall Shobu Saitama, 2004	D. anser ?? x 30 μm Yukawa-numa Nishiwaga Iwate, 2007
Dileptus sp. ? μm mac. sausage-shaped Omine-numa Tsukiyono Gunma, 2003	D. anser ? μm, x 400 Prob. 1/3 ? Kazo Saitama, 2003
D. monilatus ? μm Prob. 1/3 Koraku-en Okayama, 2002	D. monilatus ? 775 μm, x 200 Prob. 1/3 tail absent Saitama, 2001	D. monilatus ? 800 μm Prob. 1/3 tail absent Japan, 1998	Dileptus sp. 500 μm Prob. 1/3 tail absent ?? Saitama, 1999
D. monilatus ? 589 μm Prob. 1/3 tail absent Uruguay, 1999	D. monilatus ? 800 x 70 μm Akao Sakado Saitama, 2004	D. monilatus ? cell μm Japan, 1998	D. monilatus cell μm Japan, 1998
D. monilatus cell μm Japan, 1998	D. monilatus cell μm Japan, 1998	D. monilatus cell μm Japan, 1998	D. monilatus 460 x 52 μm Prob. Jionji-shinsui p. Iwatsuki-ku Saitama, 2006
Dileptus sp. 480 μm Prob. 2/5 tail absent ?? Yoshii-machi Saitama, 2001	Dileptus sp. 238 μm Prob. 2/5 tail absent Japan, 1998	Dileptus sp. 300 μm Prob. 2/5 tail absent ?? Saitama, 1999
Dileptus sp. 2 mac.? 190, 210 x μm Onnenai Kushiro marsh Hokkaido, 2005	Dileptus sp. 2 mac.? 300 x 23 μm Igashira park Mooka Tochigi, 2006
Proboscis shorter (less than 1/3) than half of the body length
Dileptus 800 μm, x 100 Inari Park Toyama, 2002	Dileptus 760 μm, x 100 Kiyose Tokyo, 2001	Dileptus 665 μm, x 200 Saitama, 1999	Dileptus 475 μm, x 200 Kagoshima, 2001
Dileptus 560 μm, x 100 Daidarabotchi-ike Iizuna-kogen Nagano, 2003	Dileptus 400 μm, x 200 Namegawa Saitama, 2003
D. aculeatus 4 mac. 275 μm Shirakawa Fukushima, 1999	D. aculeatus 4 mac. 270 x 27 μm Futayo-no-ike Haguro mountain Yamagata, 2006	D. aculeatus 4 mac. μm Omine-numa Minakami Gunma, 2007
D. gabonensis 2 mac. 238 μm Fukushima, 1999	D. gabonensis ? 2 mac. Sugata river Mibu Tochigi, 2008	Dileptus sp. cell μm Japan, 1998	Dileptus sp. pb. truncated Japan, 1998

Similar Genus ->> Trachelius; Paradileptus;

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