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Litostomatea: Haptoria: Pharyngophorida: Tracheliidae

 Dileptus cygnus
(Claparède & Lachmann, 1859)

Dileptus cygnus 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).
Species:
Similar Genus ->> Trachelius; Paradileptus;

Dileptus cygnus ?, cell body about 680 μm long, 50 μm wide, tail long, x 100, x 200, x 400, x 640, rice field near an aqueduct over Ara-kawa (Ara river), Muneoka, Shiki city, Saitama Pref., Japan, August 8, 2004 by Y. Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100
Dileptus
x 200
Dileptus Dileptus Dileptus Dileptus
x 400
Dileptus Dileptus
x 640
Dileptus Dileptus Dileptus Dileptus Dileptus

D. gigas: About 700 μm long; macronucleus sausage-shaped; contractile vacuoles line the dorsal surface and extend right to the tip of the neck region (Illustrated Guide, 1985).
D. monilatus (Stokes, 1886) Kahl, 1931: Elongate; 700 μm long; no separate tail region; macronucleus moniliform; contractile vacuoles line the dorsal surface and extend right to the tip of the neck region (Carey, 1992). Proboscis less than 1/4 of the body length.

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