Frontonia atra as illustrated in Shen & Zhang (1990) Biomonitoring Techniques Using Freshwater Microbiota, China Architecture and Building Press. This image was taken with permission from Modern Biomonitoring Techniques Using Freshwater Microbiota written by Shen Yunfen, Zhang Zongshe and colleagues, and published by China Architecture and Building Press in 1990. Image copyright: China Architecture and Building Press, used under license to MBL (micro*scope).
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From the collection
Protozoan biomonitors in China
|Description of Frontonia atra: Peniculine ciliate, 100-400 micrometres in length, easily confused with the smaller Frontonia acuminata (60-150 micrometres). Body as a flattened lemon, rounded anteriorly, tapering in the posterior to a blunted point. Darkly pigmented cytoplasm, sometimes with a colorless zone at each pole of the cell, or with a darkly pigmented spot in the anterior third. Cytostome a rounded triangle, with the wide end toward the posterior; long postoral and short preoral suture. Single macronucleus, ellipsoid; single contractile vacuole, nearly equatorial on right side. Abundant trichocysts. Common and widespread in fresh water. Feeds on diatoms and other algae.