Abstract
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 Thermus, namely, Thermus filiformis, based on ultrastructural, phenotypic, and anomalous Gram type characteristics. The cell wall of T. filiformis resembles that of Thermus aquaticus apart from the presence of an extra layer. The Thermus species tested, including T. filiformis, are negative for the aminopeptidase test, which is unusual for a gram-negative genus. T. filiformis is nonproteolytic, unlike most other Thermus 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 43280T (T = type strain).
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