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**INTRO**  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{Lee_2005}. These genera were later joined by _Altererythrobacter_ \cite{Kwon_2007} and _Croceicoccus_ \cite{Xu_2009}, the latter work also emended the description of the family. Members of the _Erythrobacteraceae_ family are Gram-negative, aerobic, 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. In this study, strain Coronado(T) was isolated from a stadium seat at Niedermeyer Field, Coronado High School in Coronado, California, USA as part of a nationwide Citizen Science project (Project MERCCURI) looking for isolates MERCCURI - www.spacemicrobes.org.) One goal of Project MERCCURI was  to send collect bacterial isolates  to be used for an experiment aboard  the International Space Station (ISS) for a growth experiment. (ISS.)  A cotton swab was used to swab the surface of a stadium seat, then dilution plated isolated via plating  onto lysogeny-broth (LB) agar plates. Almost full length (primers 27F and 1391R) 16s rRNA sequencing showed 99% identity to a few uncultured sequences at NCBI, but only no more than  95% identity to any the nearest  cultured organsim representative  (_Porphyrobacter donghaensis_)\cite{Yoon_2004}. Uncultured isolates with high identity (=>99%) were found in studies of deep ocean sediment and the human skin microbiome. Phylogenetic and biochemical characteristics show that this isolate belongs to a new genus and species within the _Erythrobacteraceae_ family. However, phylogenetic analysis of the entire family would suggest that a major taxomic revision of the entire group is required, as has been suggested by others (e.g. (_e.g_.  \cite{Rainey_2003}) Here we describe the genotypic, morphologic, and biochemical characteristics of strain Coronado(T) that Coronado(T), which  represents a novel genus and species. We propose the name of _Kirrobacter mercurialis_ gen. nov., sp. nov.