homotypic synonym, validly published under the ICNP
The e-mail address of the corresponding author given in the effective publication is not functional any more.
Rhizobiumpetrolearium is the correct name if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Rhizobium.
The epithet is petrolearium. So, the correct etymology must be "Gr. n. petra, rock", not "L. n. petra, rock" as cited in the paper Zhang et al. 2012.Publication:
Euzeby JP. List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int J Syst Bacteriol 1997; 47:590-592.