In a preliminary investigation the isolation of a caldoactive filamentous microorganism from a New Zealand hot spring was reported. This organism is described here as a new species belonging to the genus , namely, , based on ultrastructural, phenotypic, and anomalous Gram type characteristics. The cell wall of resembles that of apart from the presence of an extra layer. The species tested, including , are negative for the aminopeptidase test, which is unusual for a gram-negative genus. is nonproteolytic, unlike most other strains, and also differs radically from other strains in morphology when it is observed by using phase-contrast microscopy. The single strain of the species has been deposited with the American Type Culture Collection as strain ATCC 43280 (T = type strain).


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