NYCTOTHERUS
CLASSIFICATION
Phylum- Protozoa
Sub-phylum- Ciliophora
Class- Holotricha
Order- Trichostomatida
Genus- Nycotherus
DESCRIPTION
Nyctotherus is found as symbiont in the intestine of vertebrate and invertrbrate animals. Its body is dorsoventrally flattened and bean-shaped. Longitudinal rows of equal sized cilia are found all over the body.
Vestibule leading to cytostome is on lateral side and extended up to the middle of the body. Cytostome has dermal membrane and the cytopharynx is like spring of watch. There is one macronucleus. One micronucleus, one contractile vacuole, food vacuoles and glycogen granules in cytoplasm (endoplasm) cytopyge (anal aperture) in the form of a permanent pore. Asexual reproduction in nyctotherus takes place by binary fission.
It forms preconjuganṭs in the rectum of tadpole which conjugate during the metamorphosis of tadpole into adult frog. They assume normal size and shape in young frogs and pass out in the form of cyst with faeces. Infection takes place by consuming water and food contaminated with cysts.
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