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Taxonomy and phylogeny of the section chaetoceros(Chaetocerotaceae,Bacillariophyta),with description of two new species

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Journal of Oceanology and Limnology 2024年第4期42卷 1286-1311页

作者： Xudan LU Mengyi ZHAI Nina LUNDHOLM Yang LI Guangdong Provincial Key Laboratory of Biotechnology for Plant Development Guangzhou Key Laboratory of Subtropical Biodiversity and BiomonitoringCollege of Life ScienceSouth China Normal UniversityGuangzhou 510631China Natural History Museum of Denmark University of CopenhagenCopenhagen K 1353Denmark

chaetoceros Ehrenberg is one of the most diverse genera of planktonic *** species in section chaetoceros are characterized by cells and setae having numerous chloroplasts and being widely ***,the delimitations of some species are problematic because of limited morphological information in the classical *** strains of the section chaetoceros were established,morphological features were studied using light and electron microscopy,and the hypervariable D 1-D 3 region of the nuclear ribosomal large subunit gene was sequenced to address phylogenetic *** species belonging to the section chaetoceros were recorded,including two new species,*** *** *** *** hainanensis was characterized by straight chains,narrowly lanceolate to hexagonal apertures,sibling setae diverging in nearly right angles,stipule-shaped spines on terminal setae and arrowhead-shaped spines on intercalary *** had short straight chains,narrowly lanceolate apertures,arrowhead-shaped spines and circular poroids arranged in a grid pattern on terminal and intercalary *** phylogenetic analyses revealed six groups formed by 19 species within the section chaetoceros,which was found to be *** subdivision of the section is still not well *** morphological characters within each group varied considerably and molecular information on more species are needed to enrich the phylogenetic profiling.

关键词： morphology large subunit ribosomal RNA encoding gene(LSU) section chaetoceros chaetoceros hainanensis chaetoceros tridiscus

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