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Sonntag, B., Strüder-Kypke, M. & Summerer, M. 2008. Uroleptus willii nov. sp., a euplanktonic freshwater ciliate (Dorsomarginalia, Spirotrichea, Ciliophora) with algal symbionts: morphological description including phylogenetic data of the small subunit rRNA gene sequence and ecological notes. In E. Aescht & H. Berger (eds.), The Wilhelm Foissner Festschrift: A tribute to an outstanding protistologist on the occasion of his 60th birthday. Denisia 23: 279- 288. ≡