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**Abstract**  A novel, Gram-negative, non-spore-forming, pleomorphic yellow-orange bacterial strain was isolated from a stadium seat. Strain Coronado(T) belongs in the _Erythrobacteraceae_ family based on 16S rRNA phylogenetic analysis, but is both phylogenetically and physiologically distinct from existing genera in the family. Placement within a 16S rRNA tree shows a highly supported clade containing Coronado(T), _Porphyrobacter_, _Erythromicrobium_, and _Erythrobacter_. While this strain has Q-10 as the predominant respiratory lipoquinone, as in other members of the family, the fatty acid profile is distinct. Coronado(T) contains predominatly C18:1ω7cis and C16:0, a high percentage of the latter not being observed in any other _Erythrobacteraceae_. This strain is both catalase and oxidase negative which was not the case for the other genera present in the same clade. Coronado(T) can grow from 4-28 degrees C, at NaCl concentrations from .5-1.5%, and at pH 6.0-8.0. On the basis of phenotypic and phylogenetic data presented in this study, strain Coronado(T) represents a novel species in a new genus in the family Erythrobacteraceae _Erythrobacteraceae_  for which the name Kirrobacter mercurialis _Kirrobacter mercurialis_  gen. nov., sp. nov. is proposed; the type strain is Coronado(T) (=DSMZ ???, ATCC ???, NCTC ???)