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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 7709

Wilfried Schonborn, Wilhelm Foissner, and Ralf Meisterfeld; [Licht- und Rasterelektronenmikroskopische Untersuchungen zur Schalenmorphologie und Rassenbildung Bodenbewohnender Testaceen (Protozoa: Rhizopoda) sowie Vorschlage zur Biometrischen Charakterisierung von Testaceen-Schalen]. Protistologica XIX(4):553-566, 1983

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Some new and little known soil Testacea from GDR, Austria, and FRG are described and proposals to biometrical characterization of testacean shells are made. From the measured parameters should be nominated: arithmetic mean (x), median (M), standard deviation (s), standard error of the mean (sx), coefficient of variation (Vr), extreme values, random numbers (n). Especially important is the Vr, because he offers a good possibility to establish the steadiness of a trait. With the help of the biometrical dates and "ideal-individual" for some of the investigated populations are constructed. This "ideal-individual" is very suitable to compare several populations and species. The method of "Protargolversilberung" is introduced as a new method of preparation of slight shell structures in the testacean research. It is a valuable completion to the traditional light and scanning electron microscopical methods. The shell of the investigated Centropyxis laevigata (Penard, 1890) shows a very fine structural pattern. Centropyxis oomorpha nov. spec. differs from the other species of the genus by the bigger oviform till elliptical shell and the narrow aperture with few invagination. The species Pseudawerintzewia orbistoma nov. spec. and P. calcicola resemble each other with exception of the circular aperture. The biometrical investigations discovered geographical races of C. oomorpha and P. orbistoma. Edaphonobiotus campascoides nov. gen., nov. spec. has a collar-like enlargement aroud the aperture. The agglutinate shell is hyaline. This genus is similar to the freshwater genus Campascus and the marine genera Centropyxiella, Psammonobiotus and Micropsammella.