Portrait of slightly contracted Paracondylostoma setigerum (Foissner, 1980), a colpodid ciliate originally recovered from an alpine pond in central Austria and described by Foissner and Kreutz (Foissner, W., Kreutz, M.: Systematic position and phylogentic relationship of the genus Bursaridium, Paracondylostoma, Thylakidium, Bryometopus, and Bursaria (Ciliophora: Colpoda). Acta Protozoologica 37, 227 - 240 (1998). P. Setigerum is the type species. Overall shape is fusiform with truncate anterior. Contracts quickly closing oral aperture when disturbed. Oral aperture is anterior, funnel-shaped and extends about 1/3 the length of the cell. A line of membranelles extends completely along the margin of the aperture on the left. Somatic ciliature is uniform in longitudinal kineties. Prominent long bristle-like cilia radiate from the anterior end. The cells occupy a mucus sheath which is transparent and very difficult to see unless bacteria and debris adhere. Cells often flee the sheath when placed on the slide.Centrally located macronucleus is spherical. The contractile vacuole is located in the posterior half.From freshwater pond near Boise, Idaho. DIC optics. 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
No description of Paracondylostoma setigerum available.
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