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Kunpeng FANG, Fangru NAN, Jia FENG, Junping LÜ, Qi LIU, Xudong LIU, Shulian XIE. Pauciramus yunnanensis, gen. et sp. nov., a novel freshwater red alga from China with proposal of the Ottiales ord. nov. (Nemaliophycidae, Rhodophyta)[J]. Journal of Oceanology and Limnology, 2022, 40(3): 1245-1256 |
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Pauciramus yunnanensis, gen. et sp. nov., a novel freshwater red alga from China with proposal of the Ottiales ord. nov. (Nemaliophycidae, Rhodophyta) |
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Kunpeng FANG, Fangru NAN, Jia FENG, Junping LÜ, Qi LIU, Xudong LIU, Shulian XIE |
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School of Life Science, Shanxi Key Laboratory for Research and Development of Regional Plants, Shanxi University, Taiyuan 030006, China |
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Abstract: |
Species of the red algal order Acrochaetiales mostly inhabit marine environments, with only two freshwater taxa Audouinella and Ottia. A new genus and species are described for freshwater red alga Pauciramus yunnanensis from Ailao Mountain, Yunnan, China. It is closely related to Ottia and a new order Ottiales was proposed for these genera. Pauciramus has unique combination of morphological characteristics including the following: plants caespitose and densely pulvinate, slender uniseriate filaments with well-developed rhizoids, rarely branched, cylindrical vegetative cell with a single, ribbon-shaped and parietal chloroplast, reproduction by tetrasporangia, and dense sporangial branchlet only at the upper portion of filaments. Phylogenetic analysis of sequence data from the plastid ribulose-1,5-bisphosphate carboxylase-oxygenase large-subunit (rbcL), small subunit gene of the ribosomal cistron (SSU) and barcode region near the 5' end of the mitochondrial cytochrome oxidase subunit I (COI-5P) indicated that: the new taxon, P. yunnanensis, was in a well-supported clade with Ottia meiospora, and this clade was sister to order Palmariales and Acrochaetiales. To adhere to the principle of monophyly, a new freshwater order Ottiales including Ottia and Pauciramus is proposed. Despite the high sequence interspecific divergences and obvious morphological differences between genera Ottia and Pauciramus, seems impractical to establish a new family for a monospecific genus. Therefore, we temporarily classified Pauciramus into the family Ottiaceae, and made necessary revisions to the description to accommodate this genus. |
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Received: 2021-05-07 Revised: |
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