Cytostome

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In vivo portrait of the colpodid ciliate, Platyophrya vorax (Kahl,1926). The flask-shaped cells are very flexible. This slightly distressed individual is more globular than unstressed cells.The relatively small ovoid anterior cytostome is subapical (seen here). There is a right paraoral membrane composed of dikinetids and four rectangular left adoral membranelles. There is a postoral "pseudomembrane" consisting of closely spaced anterior dikinetids of somatic kineties. The right side is more densely ciliated than the left. The slightly spiralled somatic kineties lie in shallow cortical furrows (seen here). The central spherical macronucleus has a small central nucleolus and an adjacent micronucleus. The single contractile vacuole is subterminal posteriorly. P. vorax lacks endosymbiotic algae (present in P. sphagni which also has more numerous adoral membranelles and somatic kineties).Collected from temporary puddles with heavy growth of diatoms in a meadow near Boise, Idaho. 43°41'45.09"N 116°13'55.29"W elev.3191 ft. March 2006. DIC.