sp. nov., isolated from diseased freshwater fish in Canada at the end of the 1970s.

Genome sequence analysis of two strains collected in Canada at the end of the 1970s and deposited in 1998 at the Collection de l'Institut Pasteur has led to the taxonomic description of a novel fish-associated species in the genus . Both strains, CIP 105534 and CIP 105535, were yellow-pigmented, Gram-stain-negative, non-spore-forming rod-shaped bacteria that exhibited gliding motility. They grew aerobically in a temperature range from 5 to 30 °C with optimal growth at 25 °C on trypticase soy or Reasoner's 2A agar but they did not grow on marine agar. Their major fatty acid profiles were similar, consisting of iso-C, C ω7 and/or iso-C 2-OH (shown as summed feature 3), C 3-OH, iso-C 3-OH and C. The major polyamine was -homospermidine. Phosphatidylethanolamine and, most notably, ornithine-containing lipid OL2 and unidentified aminophospholipid APL1 were major polar lipids. A yellow pigment spot was visible after chromatographic analysis. The predominant respiratory quinone was MK-6. The G+C content of the two genomes was 34 mol% and their size was around 5.8 Mb. Comparison of the 16S rRNA gene sequences with those of the closely related type strains showed high levels of relatedness with and . All average nucleotide identity (ANI) and digital DNA-DNA hybridization values estimated against publicly available genome assemblies were lower than 90 and 30 %, respectively. Phylogenetic, phenotypic and chemotaxonomic data indicated that the two strains represent a novel species of the genus , for which the name sp. nov. is proposed. The type strain is CIP 105534 (=LMG 1342). The unique ability of to use melibiose as a sole source of carbon could provide a simple phenotypic test to discriminate from its closest relatives.