page_title: Lenarviricota
section_title: Classes
hierarchical_section_title: Lenarviricota / Classes
caption_attribution_description: English: Branch 1 of the RNA virus RNA-dependent RNA polymerases (RdRps): leviviruses and their relatives. (A) Phylogenetic tree of the virus RdRps showing ICTV-accepted virus taxa and other major groups of viruses. Approximate numbers of distinct virus RdRps present in each branch are shown in parentheses. Symbols to the right of the parentheses summarize the presumed virus host spectrum of a lineage. Green dots represent well-supported (≥0.7) branches. (B) Genome maps of a representative set of branch 1 viruses (drawn to scale) showing color-coded major conserved domains. Where a conserved domain comprises only a part of the larger protein, the rest of this protein is shown in light gray. The locations of such domains are approximated (indicated by fuzzy boundaries). CP, capsid protein; MP, movement protein; S3H, superfamily 3 helicase; SJR1 and SJR2, single jelly-roll capsid proteins of type 1 and type 2 (see Fig. 7).
context_page_description: Lenarviricota is a phylum of RNA viruses, which includes all positive-sense single-stranded RNA viruses, which infect prokaryotes. Some members also infect eukaryotes. The name of the group is a portmanteau of the names of member families "Leviviridae and Narnaviridae" and -viricota which is the suffix for a virus phylum. It has been suggested that the origin of Lenarviricota may predate that of the last universal common ancestor.
context_section_description: The following classes are recognized:
  Allassoviricetes
  Amabiliviricetes
  Howeltoviricetes
  Miaviricetes
caption: Phylogenetic tree of Lenarviricota (top), genome of different members and major conserved proteins (bottom)
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