{"refrec":{"BRefID":283639,"RR":"<b>Pinseel, E.; Hejduková, E.; Vanormelingen, P.; Kopalova, K.; Vyverman, W.; Van de Vijver, B.</b> (2017). <i>Pinnularia catenaborealis</i> sp. nov. (Bacillariophyceae), a unique chain-forming diatom species from James Ross Island and Vega Island (Maritime Antarctica). <i>Phycologia 56(1)</i>: 94-107. <a href=\"http://dx.doi.org/10.2216/16-18.1\" target=\"_blank\">http://dx.doi.org/10.2216/16-18.1</a>","BEntID":275657,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Phycologia 56(1)</i>: 94-107. <a href=\"http://dx.doi.org/10.2216/16-18.1\" target=\"_blank\">http://dx.doi.org/10.2216/16-18.1</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Pinseel, E.; Hejduková, E.; Vanormelingen, P.; Kopalova, K.; Vyverman, W.; Van de Vijver, B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Pinseel, E. <i>et al.</i>","Englishabstract":"A recent detailed survey of the Maritime Antarctic diatom flora using a fine-grained taxonomy resulted in the description of many new species of Pinnularia in general and the section Distantes, including the <i>P. borealis</i> species complex, in particular. Moreover, DNA-based studies of P. borealis revealed that many more species need to be described within this complex. During a survey of the freshwater littoral diatom flora of James Ross Island (Ulu Peninsula) and Vega Island in Maritime Antarctica, a previously unknown chain-forming species in the <i>P. borealis</i> species complex of section Distantes was cultured from three different localities. Molecular phylogenies based on the nuclear-encoded D1–D3 large-subunit ribosomal DNA and plastid rbcL genes revealed that all cultures belong to a distinct highly supported lineage within the <i>P. borealis</i> species complex. <i>Pinnularia catenaborealis</i> sp. nov. is characterised by the presence of small spines located on a raised, thin silica ridge that almost entirely surrounds the valve face near the valve face/mantle junction, and the presence of small silica plates near the apices. In culture, <i>P. catenaborealis</i> formed chains of several tens of cells and in oxidised natural material, chains up to seven frustules were observed. <i>Pinnularia catenaborealis</i> is described from the littoral zone of freshwater Black Lake (Ulu Peninsula, James Ross Island) and has also been observed on nearby Vega Island. Although <i>P. borealis</i> is generally regarded as a (semi-)terrestrial diatom complex mainly occurring in (moist) soils and mosses, <i>P. catenaborealis</i> was found in freshwater habitats with an alkaline pH and low conductivity.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"<i>Pinnularia catenaborealis</i> sp. nov. 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