Portrait of the metopid ciliate, Brachonella galeata (Kahl 1927 [Metopus galeatus]; Jankowski, 1964). The anterior half of the cell is broadly helmet-shaped. The posterior is bluntly conical. The peristome encircles the body at the junction of the anterior and posterior halves of the cell, the origin lying just anterior to the termination on the same longitudinal line. The peristome terminates in a posterior cytostome. There is an adoral zone of membranelles on the left margin of the peristome. The somatic cilia are long and sparse. There is a tuft of longer cilia at the posterior end. A single ellipsoid macronucleus is located centrally or anteriorly. There is a single irregularly shaped contractile vacuole at the posterior end. There are purple sulfur bacteria visible in food vacuoles. B. galeata is anaerobic. Collected from anoxic sediment of slow-moving freshwater stream near Boise, Idaho in April 2004.Phase contrast illumination. 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
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