Morphology and molecular phylogeny of Gomphonemopsis sieminskae sp. nov. isolated from brackish waters of the East China Sea coast
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Palaeoceanology Unit, Faculty of Geosciences, University of Szczecin, Mickiewicza 16a, 70–383 Szczecin, Poland
Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo University, 818 Fenghua Road, Ningbo 315211, China
Faculty of Biology, Institute of Ecology, Phylogeny, Diversity, J. W. Goethe-University and Forschungungsinstitut Senckenberg, Senckenberganlage 31-33, 60054, Frankfurt am Main, Germany
Institute of Ecological Sciences, South China Normal University, Guangzhou, China
Publication date: 2019-07-18
Plant and Fungal Systematics 2019; 64(1): 17–24
We describe the new species Gomphonemopsis sieminskae from brackish waters of the East China Sea littoral near Ningbo, China. Two diatom strains isolated from Ulva sp. were successfully grown, then analyzed by light (LM) and scanning electron (SEM) microscopy. The new species is compared to known Gomphonemopsis species, and similarities to G. pseudoexigua and G. obscurum are emphasized. Although the size metric data overlap and the external views are fairly similar, the two taxa differ in their valve interior. Molecular barcoding strongly discriminated G. sieminskae from G. cf. exigua, while rbcL gene-based phylogeny showed G. sieminskae to be sister to Phaeodactylum tricornutum. In this respect our results confirm the recent discovery, based on molecular data, that Gomphonemopsis is a close-relative taxon to Phaeodactylum, and place it in Phaeodactylaceae instead of Rhoicospheniaceae as inferred solely from morphology.