Genomovar is a term commonly used within the genus Burkholderia

Burkholderia

Burkholderia is a genus of proteobacteria probably best known for its pathogenic members:Burkholderia mallei, responsible for glanders, a disease that occurs mostly in horses and related animals;...

to denote strains which are phylogenetically differentiable, but are phenotypically indistinguishable. A genomovar cannot be identified by standard biochemical tests, but it is classified as a species when a biochemical test allows it to be identified.