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T halassiosira sundarbana sp. nov. ( B acillariophyta), an estuarine diatom from S undarbans mangrove ecoregion based on morphology and molecular phylogeny
Author(s) -
Samanta Brajogopal,
Bhadury Punyasloke
Publication year - 2015
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1111/pre.12084
Subject(s) - biology , mangrove , diatom , phylogenetics , estuary , botany , clade , phylogenetic tree , ecoregion , ecology , gene , biochemistry
Summary A new species of diatom, T halassiosira sundarbana , is described based on light and scanning electron microscopy along with molecular phylogeny. The specimen was collected from C hemaguri creek of the Indian part of S undarbans mangroves, and subsequently a clonal culture was established. T halassiosira sundarbana possess variable numbers of occluded processes, and one labiate process on the valve face. Valve margin is ribbed and areolae are fasciculated on the valve face. Two rings of strutted processes are present on valve face. Strutted processes are also scattered on the valve face apart from the presence of two rings. Valvocopula and copula have rows of pore, and pleurae are hyaline. B ayesian analyses of nuclear encoded small subunit ( SSU) rDNA and plastid encoded rbc L gene confirmed that T . sundarbana is phylogenetically novel. Salinity tolerance experiment with the clonal culture of T . sundarbana showed that this isolate can grow in salinity ranging from 10–35 psu. The maximum growth rate was observed in 15 psu salinity (0.5 divisions 24 h −1 ). On the basis of morphological features and molecular phylogeny, this clonal isolate is considered as a new estuarine species of T halassiosira .