Open Access

Walter Koste

• Hiermit wird zum ersten Mal über die Rotatorienfauna Kalimantans berichtet. Die Probenentnahmen erfolgten in einem Überschwemmungsgebiet am äquatorialen Mittellauf des Sungai Mahakam. Auch in Niedrigwasserzeiten perennieren dort ausgedehnte, bewaldete Sümpfe und Flachseen, in denen sich die aquatische Lebewelt konzentriert, um zu überleben. Die Artendiversität war sehr hoch. In den Proben wurden 117 Litoral- und 41 Planktonformen festgestellt. Darunter waren für SE-Asien 19 neue Rädertiere, fünf bisher unbekannte infrasubspezifische Morphen und zwei nov. spec.: Brachionus schwoerbeli und Lecane (s.str.) braumi. Außerdem wird mit Hilfe von Abbildungen über die Taxonomie einiger seltener Arten diskutiert sowie über ihre globale Verbreitung berichtet.
• In this paper, the results are published of the examination of the first plankton sam pies collected in order to study the Rolifers of Borneo. This island, the third in dimensions of the earth, and called at the moment Kalimantan, was originally covered with tropical rain lorest. We met with 158 taxa, which are summarized in a species list. 155 taxa have been idenlified to species level. Three groups of artelacts, due to formol contraction, belonging to the genera Cepha/odella and Ptygura, and to the order Bdelloidea, could not be identilied. The great diversity of species in the beginning 01 the wet season is not unusual in shallow tropical waters; it has already been encountered by the author in Amazon and in Paraguay as weil as in billabongs of Northern Australia. Mostly creeping litoral species are concerned, with an important contribution of species Irom the polysaprobe water zone. In this context, Dicranophorus caudatus and the soft-bodied species of the genus Mytilina, e.g. M. acanthophora, M. trigona and M. bisulcata, as weil as the Bdelloids Rotaria rotatoria and R. neptunia are characteristic. On the other hand, 41 planktonic Rotiler species show that locally planktonic and semi-planktonic species may occur in great abundance, even in periods of low water level. This is the case of, among others, the tropical species Anuraeopsis coelata, Asplanchna tropica, Brachionus falcatus, Collotheca omata natans, a new lorm of Euchlanis dilatata, Hexarthra insulana and Keratella tropica, next to the well-known cosmopolite tychoplanktonic species Brachionus calyciflorus s.l., Filinia longiseta, Polyarthra vulgaris and Trichocerca similis. In a separate part of this publication, 32 Rotiler species are ligured, the biogeography or the taxonomy of which is worth mentioning. Among them, species are concerned which up to now were unknown to SE-Asia, live novae lormae of known species and two up to now unknown novae species: Brachionus schwoerbeli and Lecane braumi.