portrait

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Portrait of Clathrostoma viminale (Penard, 1922) a frontoniine ciliate. Similar in overall appearance to but smaller than Frontonia leucas. The cytostome is located in a slight depression in the anterior half of the body. There is a cytopharyngeal basket (seen well here) composed of fibrils (as found in Loxodes) rather than true trichites. The somatic ciliation is uniform with a postoral suture. The sausage-shaped macronucleus is seen here with an adjacent cluster of several (1-4) micronuclei at its posterior end. A single contractile vacuole is located in the posterior 1/3. Collected from a freshwater agricultural irrigation ditch near McCall, Idaho in September 2003. DIC optics.