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Litostomatea: Haptoria: Pharyngophorida: Tracheliidae

 Dileptus anser
(Müller, 1786) Dujardin, 1841 (1840 ?)

Dileptus anser 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: 250-400 (sometimes up to 600) μm long; numerous macronuclei; contractile vacuoles in a row on the aboral surface (Kudo, 1966). 200-600 μm long; small tail region; 200-500 very small macronuclei; contractile vacuoles from anterior to posterior on the dorsal surface (Carey, 1992).
Similar Genus ->> Trachelius; Paradileptus;

Dileptus sp. (anser ?), poboscis shorter (1/2 - 1/3) than half of the body length, cell body μm long, μm wide, a row of contractile vacuoles on dorsal surface, tail region present, x 100, x 200, x 400, Shirakawa, Fukushima Pref., Japan, October 1999, collected by H. Shiomizu, photo by Y. Tsukii
scale 200 μm scale 400 μm scale 600 μm; x 100 : scale 100 μm scale 200 μm scale 300 μm; x 200
Dileptus anser Dileptus anser Dileptus anser
Dileptus anser Dileptus anser Dileptus anser

D. anser (Müller, 1786) Dujardin, 1840: 250-400 (sometimes up to 600) μm long; numerous macronuclei; contractile vacuoles in a row on the aboral surface (Kudo, 1966). 200-600 μm long; small tail region; 200-500 very small macronuclei; contractile vacuoles from anterior to posterior on the dorsal surface (Carey, 1992).
D. aculeatus Dragesco, 1960: Elongate; 300 μm long; long sharply pointed tail; 4 large rectangular macronuclei; a row of contractile vacuoles on dorsal surface (Carey, 1992).

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