abstract:The Flexiviridae were a new family of viruses in the 2004 classification of viruses, but have since the 2009 classification been split into the three new families Alphaflexiviridae, Betaflexiviridae and Gammaflexiviridae. These have in turn been subsumed under the new order Tymovirales along with the old family Tymoviridae by the International Committee on Taxonomy of Viruses based on molecular phylogenetic systematic analyses of proteins (RNA polymerase and viral coat).