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Riboviria
Ribozyviria/viroid
Phylum: Artverviricota

Viruses in this phylum utilize reverse transcription and are characterized by the presence of a reverse-transcriptase (PFAM RTase_1). Their capsids belong to the retrotranscribing-like lineage and are typically icosahedral with T=3 to T=7 symmetry, or exhibit pseudo-icosahedral architecture.

Class: Revtraviricetes
RNA-primed RTase
Order: Ortervirales
(tRNA primer, PFAM RTase_1, RNAse H) LTR Retrotransposons
(RNA primer, PFAM RTase_1, RNAse H)
Protein-primed RTase
Order: Ortervirales

(protein primer, PFAM RTase_1, RNAse H)
Order: Blubervirales

(protein primer, PFAM RTase_1, RNAse H)
Order: Unclassified

(protein primer, PFAM RTase_1, RNAse H)
Not viruses
DNA-primed RTase (DNA primer, PFAM RTase_1)
  • LINE-1: Long interspersed nuclear elements-1
      • L1 type
  • (LINE-2: Long interspersed nuclear elements-1)*
  • (LINE-3: Long interspersed nuclear elements-1)*
  • SINE-1: Short interspersed nuclear elements-1**
      • Alu, B1 types
      • B2 types

    * Genomic fossils
    ** Presumably of cellular origin
Guanosine-2'-primed RTase (G-2'OH primer, PFAM RTase_1)
    Unclassified: Retrons
  • prokaryotic retrons