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genomovar

n. (context genetics English) Any strain of an organism that is genetically different from another although it shows no phenotypical difference

Wikipedia
Genomovar

Genomovar is a term commonly used within the genera Burkholderia and Agrobacterium 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.