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Two bacterial organisms, 50640T and 823, were isolated from fresh water in Marseilles, France, and were further identified as members of the genus Yersinia on the basis of their phenotypic characteristics and 16S rRNA gene sequencing. Their unique phenotypic profile differed from that of closely related species of Yersinia bercovieri and Yersinia mollaretii by exhibiting positive indole and inositol tests, and from that of Yersinia frederiksenii by lacking the ability to ferment l-rhamnose. A polyphasic approach, including almost complete 16S rRNA gene sequencing (1461 bp) and partial sequencing of hsp60 (683 bp), gyrB (662 bp), sodA (624 bp) and rpoB (1049 bp) showed that isolates 50640T and 823 exhibited 98.5, 93.5, 90.4, 92.4 and 96.6 % similarity with Y. mollaretii, 98.7, 93.0, 90.1, 89.1 and 96.2 % with Y. bercovieri, and 98.4, 93.2, 89.8, 88.9 and 95.2 % with Y. frederiksenii, respectively. Both isolates exhibited an identical 16S rRNA gene sequence and differed by one to five point mutations in housekeeping gene sequences. Phylogenetic reconstructions based on the combination of these four housekeeping genes indicated that the two isolates formed a unique branch supported by a bootstrap value of 93 %. Their unique phenotypic traits, 16S rRNA gene sequence, together with housekeeping gene sequences exhibiting &lt;97 % similarity with closely related species, and phylogenetic analyses suggested that the two isolates represent a so far undescribed Yersinia species. The name Yersinia massiliensis sp. nov. is proposed for this new taxon (type strain 50640T=CIP 109351T=CCUG 53443T; isolate 823=CIP 109352=CCUG 53444).

Yersinia massiliensis sp. nov., isolated from fresh water