Species in Shimwellia are genetically similar to Escherichia but differ in notable ways. S. blattae can synthesize coenzyme B12[2] and S. pseudoproteus is associated with beer spoilage.[3][4]
^Thomas, M.; Cole, J. A.; Hough, J. S. (8 July 1972). "BIOCHEMICAL PHYSIOLOGY OF OBESUMBACTERIUM PROTEUS, A COMMON BREWERY CONTAMINANT". Journal of the Institute of Brewing. 78 (4): 332–339. doi:10.1002/j.2050-0416.1972.tb03457.x.