1887

Abstract

Several cold-adapted strains isolated from a variety of algal-rich Antarctic and Southern Ocean samples formed three distinct groups within the class , phylogenetically distant from other cultivated species. The first taxon, designated gen. nov., sp. nov., was isolated from sea ice and from saline lake cyanobacterial mats and includes non-motile, strictly aerobic, saccharolytic rod-like or serpentine strains that were most closely related to the genus according to 16S rDNA sequence analysis (sequence similarity 0·85). The second taxon, designated gen. nov., sp. nov., isolated from sea ice and from continental shelf sediment, formed gliding, rod-like cells that were facultatively anaerobic with a fermentative metabolism. The third taxon, designated gen. nov., sp. nov., isolated from Southern Ocean particulates and from quartz stone subliths, included strictly aerobic, pleomorphic rod-like cells. and were most closely allied with ‘ var. ’, which, on the basis of its distinctive taxonomic traits, is also proposed as a new genus and species, gen. nov., sp. nov. It is proposed that the three genera , and belong to a new family, fam. nov. (type genus ), as they possess generally similar morphological and ecophysiological characteristics and form a common and distinct clade within class .

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2003-09-01
2019-10-23
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