Ventral infraciliature of the large hypotrich ciliate, Urostyla grandis (EHRENBERG,1830). A file of buccal cirri parallels the undulating membrane (UM).Em=endoral membrane.AZM=adoral zone of membranelles.There is a zig-zag file of midventral cirri (MVC) between the right and left marginal cirral rows. There is an obliquely oriented row of about 12 transverse cirri (TC).Collected from a freshwater canal near Boise, Idaho.Stained by the protargol A technique (see Foissner, W. Europ. J. Protistol., 27:313-330;1991).Brightfield. 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 Urostyla grandis: Urostylid ciliate, 300-400 micrometres long. Body shape an elongate ellipsoid; sometimes ovoid or oblong. Flexible. Rows of marginal cirri covering ventral surface on either side of midventral complex. 10-20 transverse cirri, in a row diagonal to midline, higher on the left. Macronucleus in 100 or more parts. Contractile vacuole on left, behind the peristome. A voracious feeder, consuming rotifers, diatoms, flagellate algae. Fresh water.