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Growth in ICTV-ratified species numbers since the 7th ICTV Report in 1999. The report in 1999 was based on a five-rank structure that was introduced in 1991. The 15-rank taxonomic structure that comprised new ranks such as class, phylum, kingdom, and realm, was introduced in 2019. This figure illustrates the ongoing increase in the number of assigned taxa and the framework that allows classification of UViGs.
