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: |
200 μm
400 μm
600 μm; x 100 :
100 μm
200 μm
300 μm; x 200
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).