Salpingoeca ruttneri is a choanoflagellate consisting of a protoplast within an organic periplast or lorica. The lorica of S. ruttneri is brownish-red in color due to impregnation with iron salts. In this species the lorica attaches to the substrate by means of prong-like extensions of the lorica base (seen clearly in this image). The protoplast protrudes through an apical aperture in the lorica. A distinct collar of microvilli surrounds a single flagellum. The protoplast contracts into the lorica when disturbed. Bacteria and debris are directed toward the base of the collar in currents generated by the flagellum. Food particles are engulfed by small pseudopodia from the protoplast just outside the collar of microvilli and then digested in food vacuoles at the posterior of the cell. The genus Salpingoeca includes species formerly assigned to the genera Lagenoeca and Pachysoeca. Collected from a freshwater agricultural irrigation ditch near McCall, Idaho, November 2003. Brightfield 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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Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere
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