Shimwellia

Shimwellia is a genus of Gram-negative bacteria of the family Enterobacteriaceae. The two species of "Shimwellia" are "Shimwellia blattae" (formerly "Escherichia blattae") and "Shimwellia pseudoproteus" (formerly "Obesumbacterium pseudoproteus").
Species in "Shimwellia" are genetically similar to "Escherichia" but differ in notable ways. "S. blattae" can synthesize coenzyme B12 and "S. pseudoproteus" is associated with beer spoilage.