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A 2005 phylogenetic analysis of the _Alphaproteobacteria_ class led to the creation of a new family, _Erythrobacteraceae_, to house the genera _Erythrobacter_, _Porphyrobacter_ and _Erythromicrobium_ \cite{16166687}. These genera were later joined by _Altererythrobacter_ \cite{17911284} and _Croceicoccus_ \cite{Xu_2009}, the latter work also emended the description of the family. Members of the _Erythrobacteraceae_ family are Gram-negative, aerobic bacteria that contain cartenoids, usually appearing pink, orange or yellow. They do not form spores, are chemo-organotrophic, and are most often associated with aquatic environments.  Phylogenetic and biochemical characteristics presented here show that this isolate is clearly distinct from other members within the _Erythrobacteraceae_ family and is most closely related to the genus _Porphyrobacter_. However, a major taxonomic revision of this family is most likely required, as has been suggested by others (_e.g_. \cite{Rainey_2003} \cite{12656149}  \cite{25713040}). Here we describe the genotypic, morphologic, and biochemical characteristics of strain CoronadoT, based on which we propose the name of _Porphyrobacter mercurialis_ sp. nov.