Unrooted maximum likelihood tree of 4,717 Durnavirales RdRp sequences, with branches labelled and coloured by family (Amalgaviridae, Curvulaviridae, Fusariviridae, and Partitiviridae) or proposed genus (Picobirnaviridae), namely ‘Alpha-’, ‘Beta-’, ‘Gamma-’, ‘Delta-’, ‘Epsilon-’, ‘Zeta-’, and ‘Etapicobirnavirus’. The star represents a clade of seven divergent deltaviruses that clustered outside of the proposed genus. Branch lengths indicate the number of amino acid substitutions per site, as represented by the scale bar.