Eleven strains of a new species of the genus , characterized as having evanescent asci and Q-6 as the major ubiquinone, were isolated from sediments, a clam and a crab collected at depths of 1000–2000 m in Suruga Bay and Sagami Bay, Japan. A phylogenetic tree based on small-subunit (18S) rRNA gene sequences placed these isolates into a cluster of DNA complementarity and phylogenetic trees of internal transcribed spacer (ITS) regions and 5·8S rRNA genes showed that the isolates are closely related to , but that these two species are genetically distinct. The isolates are described as sp. nov. Because this species lacks the fermentative ability considered to be an important criterion for the genus , the definition of the genus has been emended. The type strain of is strain SY-33 (= JCM 10232).


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