Reclassification of five Fusobacterium nucleatum subspecies to species level status as F. nucleatum comb. nov., F. animalis comb. nov., F. polymorphum comb. nov., and F. vincentii comb. nov.,(including formely F. nucleatum subsp. fusiforme) and proposal of a novel species, Fusobacterium watanabei sp. nov.

There are a number of unidentified Fusobacteirum isolates at the anaerobic bacteria facility in Gifu University. We sought to sort out taxonomically once.