1887

Abstract

The Orientalis clade has a relevant significance for bivalve aquaculture since it includes the pathogens , subsp. and subsp. . However, the previous taxonomic description of the subspecies of shows some incongruities that should be emended. In the genomic age, the comparison between genome assemblies is the key to clarify the taxonomic position of both subspecies. With this purpose, we have tested the ability of multilocus sequence analysis based on eight housekeeping gene sequences ( , , , , , , and ), different genome-to-genome comparisons, chemotaxonomic features and phenotypic traits to reclassify the subspecies subsp. within the Orientalis clade. This polyphasic approach clearly demonstrated that this subspecies is phylogenetically and phenotypically distinct from and should be elevated to the rank of species as sp. nov. This reclassification allows us to update the Orientalis clade ( , , , , , and sp. nov.) and reconstruct a better phylogeny of the genus . An emended description of is provided. Finally, the proposed novel species is represented by emergent bivalve pathogens [type strain PP-638 (=CECT 8136=DSM 27349), PP2-843 and 07/118 T2] responsible for high mortalities in Spanish and French hatcheries.

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2016-11-01
2020-08-11
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