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Taxonomic rearrangement of the genus Ulkenia sensu lato based on morphology, chemotaxonomical characteristics, and 18S rRNA gene phylogeny (Thraustochytriaceae, Labyrinthulomycetes): emendation for Ulkenia and erection of Botryochytrium, Parietichytrium, and Sicyoidochytrium gen. nov.

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Mycoscience

Abstract

The genus Ulkenia is characterized by the naked protoplast stage within its life cycle. However, the 18S rRNA gene tree clearly shows that this genus is not a natural taxon, because our own isolates and reported strains separately form four well-supported monophyletic groups. These four groups are clearly distinguishable by their profiles of polyunsaturated fatty acids and carotenoid pigments and cell and colony morphology, e.g., persistence of sporangial wall, manner of the cell cleavage at the zoospore formation, and development of the ectoplasmic nets. Therefore, the four groups are assigned to four genera including three new genera, i.e., Ulkenia sensu stricto, Botryochytrium, Parietichytrium, and Sicyoidochytrium gen. nov.

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Authors and Affiliations

  1. Graduate School of Natural Science, Konan University, Hyogo, Japan

    Rinka Yokoyama

  2. School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia

    Baharuddin Salleh

  3. Department of Biology, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Higashinada, Kobe, Hyogo, 658-8501, Japan

    Daiske Honda

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  1. Rinka Yokoyama
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  2. Baharuddin Salleh
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  3. Daiske Honda
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Correspondence to Daiske Honda.

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Yokoyama, R., Salleh, B. & Honda, D. Taxonomic rearrangement of the genus Ulkenia sensu lato based on morphology, chemotaxonomical characteristics, and 18S rRNA gene phylogeny (Thraustochytriaceae, Labyrinthulomycetes): emendation for Ulkenia and erection of Botryochytrium, Parietichytrium, and Sicyoidochytrium gen. nov.. Mycoscience 48, 329–341 (2007). https://doi.org/10.1007/s10267-007-0377-1

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