The stichotrichine ciliate, Chaetospira remex (Hudson,1875; Kahl,1932) stained with methyl green-pyronin to demonstrate the bipartite macronucleus. The animal is completely withdrawn into the tubular lorica. The two round macronuclei are stained green. The micronucleus is not seen in this image. The illustration in Kahl's compendium incorrectly depicts C. remex with a single macronucleus (Kahl,A.; Die Tierwelt Deutschlands und der angrenzenden Meeresteile. Teil 25 [Urtiere oder Protozoa I: Wimpertiere oder Ciliata (Infusoria) 3. Spirotricha. Germany:Verlag von Gustav Fischer. 1932, p. 542).Collected from a freshwater pond near Boise Idaho May 2004. Brightfield illumination with closed condenser. This image was taken by William Bourland. He now uses a Zeiss Axioskop 2 with Spot Insight and Spot Flex CCD cameras (Diagnostic Instruments). Image copyright: William Bourland, image used under license to MBL (micro*scope).
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From the collection
Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere
|Description of Chaetospira remex: Body elongated, very contractile; length 150-560 um when extended; housed in tube-like smooth lorica (300-1,250 um long), more or less incrusted with detritus; with long flexible anterior proboscis more than one-quarter of body length when extended; somatic ciliation spirally in 3 rows (very similar to the genus Stichotricha but this is characterized by a comparatively short proboscis of less than one-quarter the length of the body); adoral zone of membranelles very elongated, running along the proboscis; 2 macronuclei; contractile vacuole located in the posterior vicinity of the buccal area.
Measurements; Length of cell 175 um; length of lorica 315 um.
Hartmut Bick; Ciliated protozoa: An illustrated guide to the species used as biological indicators in freshwater biology. Geneva:World Health Organization. :1-195, 1972. |