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Cellular identity of an 18S rRNA gene sequence clade within the class Kinetoplastea: the novel genus Actuariola gen. nov. (Neobodonida) with description of the type species Actuariola framvarensis sp. nov.

¹ Department of Biology, TU Kaiserslautern, Erwin-Schrödinger Str. 14, D-67663 Kaiserslautern, Germany
² Austrian Academy of Sciences, Institute for Limnology, Mondseestr. 9, A-5310 Mondsee, Austria
³ Institute of Biology, University Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
⁴ Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK

Correspondence
Thorsten Stoeck
stoeck{at}rhrk.uni-kl.de

Environmental molecular surveys of microbial diversity have uncovered a vast number of novel taxonomic units in the eukaryotic tree of life that are exclusively known by their small-subunit (SSU) rRNA gene signatures. In this study, we reveal the cellular and taxonomic identity of a novel eukaryote SSU rRNA gene sequence clade within the Kinetoplastea. Kinetoplastea are ubiquitously distributed flagellated protists of high ecological and medical importance. We isolated an organism from the oxic–anoxic interface of the anoxic Framvaren Fjord (Norway), which branches within an unidentified kinetoplastean sequence clade. Ultrastructural studies revealed a typical cellular organization that characterized the flagellated isolate as a member of the order Neobodonida Vickerman 2004, which contains five genera. The isolate differed in several distinctive characters from Dimastigella, Cruzella, Rhynchobodo and Rhynchomonas. The arrangement of the microtubular rod that supports the apical cytostome and the cytopharynx differed from the diagnosis of the fifth described genus (Neobodo Vickerman 2004) within the order Neobodonida. On the basis of both molecular and microscopical data, a novel genus within the order Neobodonida, Actuariola gen. nov., is proposed. Here, we characterize its type species, Actuariola framvarensis sp. nov., and provide an in situ tool to access the organism in nature and study its ecology.

Published online ahead of print on 1 July 2005 as DOI 10.1099/ijs.0.63769-0.

The GenBank/EMBL/DDBJ accession number for the SSU rRNA gene sequence of Actuariola framvarensis strain FV18-8TS is AY963571.

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