Urotricha psenneri n. sp. and Amphileptus piger (Vuxanovici, 1962) n. comb., two planktonic ciliates (Protozoa, Ciliophora) from an oligotrophic lake in Austria. Journal of Eukaryotic Microbiology, 51(6), November 2004: 670-677. 670 [Zoological Record Volume 141]