Genera /dnr/ is a taxonomic rank used in the biological cl.ification of living and fossil organisms, as well as viruses, in biology. In the hierarchy of biological cl.ification, genus comes above species and below family..This information often can allow identification of an organism to the genus level, or can minimize the possibility that it belongs to one or another group. Colony .Streptococcus is one of the most common bacteria in your microbiome and is typi.y found in your nose and throat. However, Streptococcus is simply the genus name. If we look at the various species within this genus, we find they perform very different functions..Specifi.y, we: a identify proteins that are unique to a particular strain, species, or genus; b extract the set of proteins common to two or more strains or species; and c determine the organism most closely related to a particular genus, species or strain..