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International Journal of Systematic and Evolutionary Microbiology, Vol 50, 2101-2108, Copyright © 2000 by Society for General Microbiology

Thermococcus aegaeicus sp. nov. and Staphylothermus hellenicus sp. nov., two novel hyperthermophilic archaea isolated from geothermally heated vents off Palaeochori Bay, Milos, Greece

H Arab, H Volker and M Thomm
Institut fur Allgemeine Mikrobiologie, Christian Albrechts Universitat zu Kiel, Universitat Kiel, Am Botanischen Garten 1--9, 24118 Kiel, Germany

Two novel, hyperthermophilic, anaerobic, heterotrophic archaea were isolated from shallow hydrothermal vents off Palaeochori Bay, Milos, Greece. Strain P5(T) (BK17S6-3-b2(T)) is an irregular coccus, with a single polar flagellum, growing optimally at 90 degrees C, pH 6 and 2% NaCl. The DNA G+C content was 45 mol%. Due to its morphology, phylogenetic analyses based on 16S rRNA gene sequencing, DNA--DNA hybridization experiments, physiological properties and nutritional features, this strain represents a new species within the genus Thermococcus for which the name Thermococcus aegaeicus is proposed. The type strain is P5(T) (=DSM 12767(T)=JCM 10828(T)). Strain P8(T) (BK20S6-10-b1(T)) is a coccus that forms aggregates. It grew optimally at 85 degrees C, pH 6 and 3% NaCl. The DNA G+C content was 38 mol%. Physiological properties and sequence analysis of the 16S rRNA gene, as well as DNA--DNA hybridization experiments, indicate that this strain is a new species belonging to the genus Staphylothermus for which the name Staphylothermus hellenicus is proposed. The type strain is P8(T) (=DSM 12710(T)=JCM 10830(T)).


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