Open Access

Walter Koste

• Qualitative Planktonproben, die in den Jahren 1985 und 1986 in dem tropischen Lago do Macaco, einem Ufersee des Rio Trombetas, einem der aus dem Nordwesten kommenden Nebenflüsse des Amazonas, gezogen wurden, sind auf ihren Gehalt an Rotatorien untersucht worden. Es wurden auffallend viele endemische Arten der Neotropis gefunden, insgesamt 12 von 49. Sechs seltene (Anuraeopsis sioli KOSTE; Ascomorpha klementi HAUER; Brachionus gessneri HAUER; Brachionus urceolaris amazonica KOSTE& ROBERTSON; Keratella nhamunda KOSTE& ROBERTSON; Paranuraeopsis quadriantennata KOSTE)und zwei Modifikationen (Trichocerca pusilla LAUTERBORN 1898 nov. f. grandis und Trichocerca similis (WIERZEJSKI 1893) f. grandis nach HAUER)werden mit Unterstützung von Abbildungen besprochen.
• For the first time plankton sampies from Lake Macaco, which lies on the eastern shore of the River Trombetas, Amazon, Brazil, were investigated for rotifers. This lake is situated in a region in which the Rotifera Fauna has scarcely been studied. The microscopical research of the material resulted in 48 cosmopolitical, tropical and subtropical species. The Bdelloidae were not identifiable, because they were found most as preservation artifacts. Some specimen of this taxon may belong to the genera Philodina and Rotaria. 14 species were endemics of Neotropis. New information about taxonorny, ecology and distribution of some interesting and rare animals was able to be added. These are: Anuraeopsis sioli KOSTE, Ascomorpha klementi (HAUER), Brachionus urceolaris amazonica KOSTE & ROBERTSON,Keratella nhamunda (KOSTE& ROBERTSAN), Paranuraeopsis quadriantennata KOSTE,Trichocerca pusilla (LAUTERBORN,1898) f. grandis nov. forma and Trichocerca similis (WIERZEJSKI,1893) f. grandis after HAUER 1965.