Negative-strand RNA virus

Negarnaviricota

A montage of transmission electron micrographs of some viruses in the phylum Negarnaviricota. Not to scale. Species from left to right, top to bottom: Zaire ebolavirus, Sin Nombre orthohantavirus, Human orthopneumovirus, Hendra henipavirus, an unidentified rhabdovirus, Measles morbillivirus.
Virus classification
(unranked):  | Virus
Realm:  | Riboviria
Kingdom:  | Orthornavirae
Phylum:  | Negarnaviricota
Subtaxa

See text

Synonyms[1][2]

* Negative-sense RNA viruses (NSVs)[note 1]

Negative-strand RNA viruses (−ssRNA viruses) are a group of related viruses that have negative-sense, single-stranded genomes made of ribonucleic acid. They have genomes that act as complementary strands from which messenger RNA (mRNA) is synthesized by the viral enzyme RNA-dependent RNA polymerase (RdRp). During replication of the viral genome, RdRp synthesizes a positive-sense antigenome that it uses as a template to create genomic negative-sense RNA. Negative-strand RNA viruses also share a number of other characteristics: most contain a viral envelope that surrounds the capsid, which encases the viral genome, −ssRNA virus genomes are usually linear, and it is common for their genome to be segmented.

Negative-strand RNA viruses constitute the phylum Negarnaviricota, in the kingdom Orthornavirae and realm Riboviria. They are descended from a common ancestor that was a double-stranded RNA (dsRNA) virus, and they are considered to be a sister clade of reoviruses, which are dsRNA viruses. Within the phylum, there are two major branches that form two subphyla: Haploviricotina, whose members are mostly non-segmented and which encode an RdRp that synthesizes caps on mRNA, and Polyploviricotina, whose members are segmented and which encode an RdRp that snatches caps from host mRNAs. A total of six classes in the phylum are recognized.

Negative-strand RNA viruses are closely associated with arthropods and can be informally divided between those that are reliant on arthropods for transmission and those that are descended from arthropod viruses but can now replicate in vertebrates without the aid of arthropods. Prominent arthropod-borne −ssRNA viruses include the Rift Valley fever virus and the tomato spotted wilt virus. Notable vertebrate −ssRNA viruses include the Ebola virus, hantaviruses, influenza viruses, the Lassa fever virus, and the rabies virus.

## Contents

* 1 Characteristics
* 1.1 Genome
* 1.2 Replication and transcription
* 1.3 Morphology
* 1.4 Evolution
* 2 Phylogenetics
* 3 Classification
* 4 Disease
* 5 History
* 6 Etymology
* 7 Gallery
* 8 Notes
* 9 References
* 10 Further reading

## Characteristics[edit | edit source]

### Genome[edit | edit source]

Vesicular stomatitis virus (VSV) virion and Mononegavirales genomes

All viruses in Negarnaviricota are negative-sense, single-stranded RNA (−ssRNA) viruses. They have genomes made of RNA, which are single instead of double-stranded. Their genomes are negative sense, meaning that messenger RNA (mRNA) can be synthesized directly from the genome by the viral enzyme RNA-dependent RNA polymerase (RdRp), also called RNA replicase, which is encoded by all −ssRNA viruses. Excluding viruses in the genus Tenuivirus and some in the family Chuviridae, all −ssRNA viruses have linear rather than circular genomes, and the genomes may be segmented or non-segmented.[1][3][4] All −ssRNA genomes contain terminal inverted repeats, which are palindromic nucleotide sequences at each end of the genome.[5]

### Replication and transcription[edit | edit source]

Influenza virus replication cycle

Replication of −ssRNA genomes is executed by RdRp, which initiates replication by binding to a leader sequence on the 3'-end (usually pronounced "three prime end") of the genome. RdRp then uses the negative sense genome as a template to synthesize a positive-sense antigenome. When replicating the antigenome, RdRp first binds to the trailer sequence on the 3'-end of the antigenome. Thereafter, RdRp ignores all transcription signals on the antigenome and synthesizes a copy of the genome while using the antigenome as a template.[6] Replication is executed while the genome is inside the nucleocapsid, and RdRp unveils the capsid and translocates along the genome during replication. As new nucleotide sequences are synthesized by RdRp, capsid proteins are assembled and encapsidate the newly replicate viral RNA.[2]

Transcribing mRNA from the genome follows the same directional pattern as producing the antigenome. At the leader sequence, RdRp synthesizes a 5-'end (usually pronounced "five prime end") triphosphate-leader RNA and either, in the case of the subphylum Haploviricotina, caps the 5'-end or, in the case of the subphylum Polyploviricotina, snatches a cap from a host mRNA and attaches it to the viral mRNA so that the mRNA can be translated by the host cell's ribosomes.[7][8][9]

After capping the mRNA, RdRp initiates transcription at a gene start signal and later terminates transcription upon reaching a gene end signal.[10] At the end of transcription, RdRp synthesizes a polyadenylated tail (poly (A) tail) consisting of hundreds of adenines in the mRNA's 3-end, which may be done by stuttering on a sequence of uracils.[11][12] After the poly (A) tail is constructed, the mRNA is released by RdRp. In genomes that encode more than one transcribable portion, RdRp can continue scanning to the next start sequence to continue with transcription.[10][7][13]

Some −ssRNA viruses are ambisense, meaning that both the negative genomic strand and positive antigenome separately encode different proteins. In order to transcribe ambisense viruses, two rounds of transcription are performed: first, mRNA is produced directly from the genome; second, mRNA is created from the antigenome. All ambisense viruses contain a hairpin loop structure to stop transcription after the protein's mRNA has been transcribed.[14]

### Morphology[edit | edit source]

Peribunyavirus structure (left); transmission electron micrograph of California encephalitis virus (right)

Negative-strand RNA viruses contain a ribonucleoprotein complex composed of the genome and an RdRp attached to each segment of the genome surrounded by a capsid.[15] The capsid is composed of proteins whose folded structure contains five alpha-helices in the N-terminal lobe (5-H motif) and three alpha-helices in the C-terminal lobe (3-H motif). Inside the capsid, the genome is sandwiched between these two motifs.[2] Excluding the family Aspiviridae, −ssRNA viruses contain an outer viral envelope, a type of a lipid membrane that surrounds the capsid. The shape of the virus particle, called a virion, of −ssRNA viruses varies and may be filamentous, pleomorphic, spherical, or tubular.[16]

### Evolution[edit | edit source]

Genome segmentation is a prominent trait among many −ssRNA viruses, and −ssRNA viruses range from having genomes with one segment, typical for members of the order Mononegavirales, to genomes with ten segments, as is the case for Tilapia tilapinevirus.[5][17] There is no clear trend over time that determines the number of segments, and genome segmentation among −ssRNA viruses appears to be a flexible trait since it has evolved independently on multiple occasions. Most members of the subphylum Haploviricotina are nonsegmented, whereas segmentation is universal in Polyploviricotina.[2][5]

## Phylogenetics[edit | edit source]

Phylogeny of −ssRNA viruses

Phylogenetic analysis based on RdRp shows that −ssRNA viruses are descended from a common ancestor and that they are likely a sister clade of reoviruses, which are dsRNA viruses. Within the phylum, there are two clear branches, assigned to two subphyla, based on whether RdRp synthesizes a cap on viral mRNA or snatches a cap from host mRNA and attaches that cap to viral mRNA.[1][3]

Within the phylum, −ssRNA viruses that infect arthropods appear to be basal and the ancestors of all other −ssRNA viruses. Arthropods frequently live together in large groups, which allows for viruses to be transmitted easily. Over time, this has led to arthropod −ssRNA viruses gaining a high level of diversity. While arthropods host large quantities of viruses, there is disagreement about the degree to which cross-species transmission of arthropod −ssRNA viruses occurs among arthropods.[4][5]

Plant and vertebrate −ssRNA viruses tend to be genetically related to arthropod-infected viruses. Furthermore, most −ssRNA viruses outside of arthropods are found in species that interact with arthropods. Arthropods therefore serve as both key hosts and vectors of transmission of −ssRNA viruses. In terms of transmission, non-arthropod −ssRNA viruses can be distinguished between those that are reliant on arthropods for transmission and those that can circulate among vertebrates without the aid of arthropods. The latter group is likely to have originated from the former, adapting to vertebrate-only transmission.[5]

## Classification[edit | edit source]

Negarnaviricota belongs to the kingdom Orthornavirae, which encompasses all RNA viruses that encode RdRp, and the realm Riboviria, which includes Orthornavirae as well as all viruses that encode reverse transcriptase in the kingdom Pararnavirae. Negarnaviricota contains two subphyla, which contain a combined six classes, five of which are monotypic down to lower taxa:[2][9][18]

Phylogenetic tree of Negarnaviricota (top), genome of different members and major conserved proteins (bottom)

* Subphylum: Haploviricotina, which contains −ssRNA viruses that encode an RdRp that synthesizes a cap structure on viral mRNA and which usually have nonsegmented genomes
* Class: Chunquiviricetes
* Order: Muvirales
* Family: Qinviridae
* Genus: Yingvirus
* Class: Milneviricetes
* Order: Serpentovirales
* Family: Aspviridae
* Genus: Ophiovirus
* Class: Monjiviricetes
* Class: Yunchangviricetes
* Order: Goujianvirales
* Family: Yueviridae
* Genus: Yuyuevirus
* Subphylum: Polyploviricotina, which contains −ssRNA viruses that encode an RdRp that takes a cap from host mRNA to use as the cap on viral mRNA and which have segmented genomes
* Class: Ellioviricetes
* Order: Bunyavirales
* Class: Insthoviricetes
* Order: Articulavirales

Negative-strand RNA viruses are classified as Group V in the Baltimore classification system, which groups viruses together based on their manner of mRNA production and which is often used alongside standard virus taxonomy, which is based on evolutionary history. Therefore, Group V and Negarnaviricota are synonymous.[1]

## Disease[edit | edit source]

Liver from an individual with Lassa fever

Negative-strand RNA viruses caused many widely known diseases. Many of these are transmitted by arthropods, including the Rift Valley fever virus and the tomato spotted wilt virus.[19][20] Among vertebrates, bats and rodents are common vectors for many viruses, including the Ebola virus and the rabies virus, transmitted by bats and other vertebrates,[21][22] and the Lassa fever virus and hantaviruses, transmitted by rodents.[23][24] Influenza viruses are common among birds and mammals.[25] Human-specific −ssRNA viruses include the measles virus and the mumps virus.[26][27]

## History[edit | edit source]

Many diseases caused by −ssRNA viruses have been known throughout history, including hantavirus infection, measles, and rabies.[28][29][30] In modern history, some such as Ebola and influenza have caused deadly disease outbreaks.[31][32] The vesicular stomatitis virus, first isolated in 1925 and one of the first animal viruses to be studied because it could be studied well in cell cultures, was identified as an −ssRNA virus, which was unique at the time because other RNA viruses that had been discovered were positive sense.[33][34] In the early 21st century, the bovine disease rinderpest, caused by −ssRNA rinderpest virus, became the second disease to be eradicated, after smallpox, caused by a DNA virus.[35]

In the 21st century, viral metagenomics has become common to identify viruses in the environment. For −ssRNA viruses, this allowed for a large number of invertebrate, and especially arthropod, viruses to be identified, which helped to provide insight into the evolutionary history of −ssRNA viruses. Based on phylogenetic analysis of RdRp showing that −ssRNA viruses were descended from a common ancestor, Negarnaviricota and its two subphyla were established in 2018, and it was placed into the then newly established realm Riboviria.[1][36]

## Etymology[edit | edit source]

Negarnaviricota takes the first part of its name from Latin nega, meaning negative, the middle part rna refers to RNA, and the final part, -viricota, is the suffix used for virus phyla. The subphylum Haploviricotina takes the first part of its name, Haplo, from Ancient Greek ἁπλός, meaning simple, and -viricotina is the suffix used for virus subphyla. The subphylum Polyploviricotina follows the same pattern, Polyplo being taken from Ancient Greek πολύπλοκος, meaning complex.[1]

## Gallery[edit | edit source]

* Lassa virus (Arenaviridae)

* Lymphocytic choriomeningitis virus (Arenaviridae)

* Hantavirus (Hantaviridae)

* Marburg virus (Filoviridae)

* Ebola virus (Filoviridae)

* Influenza (Orthomyxoviridae)

* Measles (Paramyxoviridae)

* Mumps virus (Paramyxoviridae)

* Human respiratory syncytial virus (Paramyxoviridae)

* Parainfluenza (Paramyxoviridae)

* Rabies (Rhabdoviridae)

* Vesicular stomatitis virus (Rhabdoviridae)

## Notes[edit | edit source]

1. ↑ The hepatitis D virus is often called a virus but can be more specifically described as a virusoid-like pathogenic −ssRNA strand. It is excluded from Negarnaviricota because although it is −ssRNA, it does not encode RdRp, which is the unifying trait of viruses in Orthornavirae.

## References[edit | edit source]

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Wolf Y, Krupovic M, Zhang YZ, Maes P, Dolji V, Koonin EV (21 August 2017). "Megataxonomy of negative-sense RNA viruses" (docx). International Committee on Taxonomy of Viruses (ICTV). Archived from the original on 12 February 2023. Retrieved 6 August 2020.
2. ↑ 2.0 2.1 2.2 2.3 2.4 Luo M, Terrel JR, Mcmanus SA (30 July 2020). "Nucleocapsid Structure of Negative Strand RNA Virus". Viruses. 12 (8): 835. doi:10.3390/v12080835. PMC 7472042. PMID 32751700.
3. ↑ 3.0 3.1 Wolf YI, Kazlauskas D, Iranzo J, Lucia-Sanz A, Kuhn JH, Krupovic M, Dolja VV, Kooning EV (27 November 2018). "Origins and Evolution of the Global RNA Virome". mBio. 9 (6): e02329-18. doi:10.1128/mBio.02329-18. PMC 6282212. PMID 30482837.
4. ↑ 4.0 4.1 Käfer S, Paraskevopoulou S, Zirkel F, Wieseke N, Donath A, Petersen M, Jones TC, Liu S, Zhou X, Middendorf M, Junglen S, Misof B, Drosten C (12 December 2019). "Re-assessing the diversity of negative strand RNA viruses in insects". PLOS Pathog. 15 (12): e1008224. doi:10.1371/journal.ppat.1008224. PMC 6932829. PMID 31830128.
5. ↑ 5.0 5.1 5.2 5.3 5.4 Li CX, Shi M, Tian JH, Lin XD, Kang YJ, Chen LJ, Qin XC, Xu J, Holmes EC, Zhang YZ (29 January 2015). "Unprecedented genomic diversity of RNA viruses in arthropods reveals the ancestry of negative-sense RNA viruses". eLife. 4 (4): e05378. doi:10.7554/eLife.05378. PMC 4384744. PMID 25633976. Archived from the original on 26 May 2021. Retrieved 6 August 2020.
6. ↑ "Negative stranded RNA virus replication". ViralZone. Swiss Institute of Bioinformatics. Archived from the original on 5 May 2021. Retrieved 6 August 2020.
7. ↑ 7.0 7.1 "Negative-stranded RNA virus transcription". ViralZone. Swiss Institute of Bioinformatics. Archived from the original on 23 May 2021. Retrieved 6 August 2020.
8. ↑ "Cap snatching". ViralZone. Swiss Institute of Bioinformatics. Archived from the original on 8 October 2020. Retrieved 6 August 2020.
9. ↑ 9.0 9.1 Kuhn JH, Wolf YI, Krupovic M, Zhang YZ, Maes P, Dolja VV, Koonin EV (February 2019). "Classify viruses - the gain is worth the pain". Nature. 566 (7744): 318–320. Bibcode:2019Natur.566..318K. doi:10.1038/d41586-019-00599-8. PMID 30787460. S2CID 67769904. Archived from the original on 7 November 2020. Retrieved 6 August 2020.
10. ↑ 10.0 10.1 Fearns, Rachel; Plemper, Richard K (15 April 2017). "Polymerases of paramyxoviruses and pneumoviruses". Virus Research. 234: 87–102. doi:10.1016/j.virusres.2017.01.008. ISSN 0168-1702. PMC 5476513. PMID 28104450.
11. ↑ Harmon, Shawn B.; Megaw, A. George; Wertz, Gail W. (1 January 2001). "RNA Sequences Involved in Transcriptional Termination of Respiratory Syncytial Virus". Journal of Virology. 75 (1): 36–44. doi:10.1128/JVI.75.1.36-44.2001. PMC 113895. PMID 11119571.
12. ↑ Jacques, J. P.; Kolakofsky, D. (1 May 1991). "Pseudo-templated transcription in prokaryotic and eukaryotic organisms". Genes & Development. 5 (5): 707–713. doi:10.1101/gad.5.5.707. ISSN 0890-9369. PMID 2026325. Archived from the original on 26 December 2022. Retrieved 30 January 2023.
13. ↑ "Negative-stranded RNA virus polymerase stuttering". ViralZone. Swiss Institute of Bioinformatics. Archived from the original on 10 May 2021. Retrieved 6 August 2020.
14. ↑ "Ambisense transcription in negative stranded RNA viruses". ViralZone. Swiss Institute of Bioinformatics. Archived from the original on 26 February 2021. Retrieved 6 August 2020.
15. ↑ Zhou H, Sun Y, Guo Y, Lou Z (September 2013). "Structural perspective on the formation of ribonucleoprotein complex in negative-sense single-stranded RNA viruses". Trends Microbiol. 21 (9): 475–484. doi:10.1016/j.tim.2013.07.006. PMID 23953596.
16. ↑ Fermin, G. (2018). Viruses: Molecular Biology, Host Interactions and Applications to Biotechnology. Elsevier. pp. 19–27, 43. doi:10.1016/B978-0-12-811257-1.00002-4. ISBN 9780128112571. S2CID 89706800. Archived from the original on 22 October 2020. Retrieved 30 January 2023.
17. ↑ Bacharach E, Mishra N, Briese T, Zody MC, Kembou Tsofack JE, Zamostiano R, Berkowitz A, Ng J, Nitido A, Corvelo A, Toussaint NC, Abel Nielsen SC, Hornig M, Del Pozo J, Bloom T, Ferguson H, Eldar A, Lipkin WI (5 April 2016). "Characterization of a Novel Orthomyxo-like Virus Causing Mass Die-Offs of Tilapia". mBio. 7 (2): e00431-16. doi:10.1128/mBio.00431-16. PMC 4959514. PMID 27048802.
18. ↑ "Virus Taxonomy: 2019 Release". talk.ictvonline.org. International Committee on Taxonomy of Viruses. Archived from the original on 20 March 2020. Retrieved 6 August 2020.
19. ↑ Hartman A (June 2017). "Rift Valley Fever". Clin Lab Med. 37 (2): 285–301. doi:10.1016/j.cll.2017.01.004. PMC 5458783. PMID 28457351.
20. ↑ Scholthof KB, Adkins S, Czosnek H, Palukaitis P, Jacquot E, Hohn T, Hohn B, Saunders K, Candresse T, Ahlquist P, Hemenway C, Foster GD (December 2011). "Top 10 plant viruses in molecular plant pathology". Mol Plant Pathol. 12 (9): 938–954. doi:10.1111/j.1364-3703.2011.00752.x. PMC 6640423. PMID 22017770.
21. ↑ Muñoz-Fontela C, McElroy AK (2017). "Ebola Virus Disease in Humans: Pathophysiology and Immunity". Curr Top Microbiol Immunol. Current Topics in Microbiology and Immunology. 411: 141–169. doi:10.1007/82_2017_11. ISBN 978-3-319-68946-3. PMC 7122202. PMID 28653186.
22. ↑ Fisher CR, Streicker DG, Schnell MJ (April 2018). "The spread and evolution of rabies virus: conquering new frontiers". Nat Rev Microbiol. 16 (4): 241–255. doi:10.1038/nrmicro.2018.11. PMC 6899062. PMID 29479072.
23. ↑ Yun NE, Walker DH (9 October 2012). "Pathogenesis of Lassa fever". Viruses. 4 (10): 2031–2048. doi:10.3390/v4102031. PMC 3497040. PMID 23202452.
24. ↑ Avsic-Zupanc T, Saksida A, Korva M (April 2019). "Hantavirus infections". Clin Microbiol Infect. 21S: e6–e16. doi:10.1111/1469-0691.12291. PMID 24750436. Archived from the original on 20 October 2021. Retrieved 6 August 2020.
25. ↑ Borkenhagen LK, Salman MD, Ma MJ, Gray GC (November 2019). "Animal influenza virus infections in humans: A commentary". Int J Infect Dis. 88: 113–119. doi:10.1016/j.ijid.2019.08.002. PMID 31401200. Archived from the original on 1 July 2023. Retrieved 6 August 2020.
26. ↑ "Transmission of Measles". cdc.gov. Centers for Disease Control and Prevention (CDC). 5 February 2018. Archived from the original on 6 August 2020. Retrieved 6 August 2020.
27. ↑ Rubin S, Eckhaus M, Rennick LJ, Bamford CG, Duprex WP (January 2015). "Molecular biology, pathogenesis and pathology of mumps virus". J Pathol. 235 (2): 242–252. doi:10.1002/path.4445. PMC 4268314. PMID 25229387.
28. ↑ Jiang H, Zheng X, Wang L, Du H, Wang P, Bai X (2017). "Hantavirus infection: a global zoonotic challenge". Virol Sin. 32 (1): 32–43. doi:10.1007/s12250-016-3899-x. PMC 6598904. PMID 28120221.
29. ↑ "Measles history". cdc.gov. Centers for Disease Control and Prevention (CDC). 5 February 2018. Archived from the original on 6 April 2020. Retrieved 6 August 2020.
30. ↑ Velasco-Villa A, Mauldin MR, Shi M, Escobar LE, Gallardo-Romero NF, Damon I, Olson VA, Streicker DG, Emerson G (October 2017). "The history of rabies in the Western Hemisphere". Antiviral Res. 146: 221–232. doi:10.1016/j.antiviral.2017.03.013. PMC 5620125. PMID 28365457.
31. ↑ Zawilinska B, Kosz-Vnenchak M (2014). "General introduction into the Ebola virus biology and disease" (PDF). Folia Med Cracov. 54 (3): 57–65. PMID 25694096. Archived (PDF) from the original on 29 August 2021. Retrieved 6 August 2020.
32. ↑ Krammer F, Smith G, Fouchier R, Peiris M, Kedzierska K, Doherty PC, Palese P, Shaw ML, Treanor J, Webster RG, García-Sastre A (28 June 2018). "Influenza". Nat Rev Dis Primers. 4 (1): 3. doi:10.1038/s41572-018-0002-y. PMC 7097467. PMID 29955068.
33. ↑ "Vesicular stomatitis virus" (PDF). Swine Health Information Center. Center for Food Security and Public Health, College of Veterinary Medicine, Iowa State University. November 2015. Archived (PDF) from the original on 29 August 2021. Retrieved 6 August 2020.
34. ↑ Kolakofsky D (April 2015). "A short biased history of RNA viruses". RNA. 21 (4): 667–669. doi:10.1261/rna.049916.115. PMC 4371325. PMID 25780183. Archived from the original on 27 February 2022. Retrieved 6 August 2020.
35. ↑ Greenwood B (12 May 2014). "The contribution of vaccination to global health: past, present and future". Philos Trans R Soc Lond B Biol Sci. 369 (1645): 20130433. doi:10.1098/rstb.2013.0433. PMC 4024226. PMID 24821919.
36. ↑ "ICTV Taxonomy history: Negarnaviricota". International Committee on Taxonomy of Viruses (ICTV). Archived from the original on 13 May 2023. Retrieved 6 August 2020.

## Further reading[edit | edit source]

| Wikispecies has information related to Negative-strand RNA virus

|

* Ward, C. W. (1993). "Progress towards a higher taxonomy of viruses". Research in Virology. 144 (6): 419–53. doi:10.1016/S0923-2516(06)80059-2. PMC 7135741. PMID 8140287.

* v
* t
* e

Baltimore (virus classification)

DNA|

I: dsDNA viruses

| Duplodnaviria|

| Heunggongvirae|

| Peploviricota|

| Herviviricetes|

| Herpesvirales|

* Alloherpesviridae
* Herpesviridae
* Malacoherpesviridae

|

Uroviricota|

| Caudoviricetes|

| Caudovirales|

* Ackermannviridae
* Autographiviridae
* Chaseviridae
* Demerecviridae
* Drexlerviridae
* Herelleviridae
* Myoviridae
* Podoviridae
* Siphoviridae
* Zobellviridae

|

Monodnaviria|

| Shotokuvirae|

| Cossaviricota|

| Papovaviricetes|

| Sepolyvirales|

* Polyomaviridae

|

Zurhausenvirales|

* Papillomaviridae

Varidnaviria|

| Bamfordvirae|

| Nucleocytoviricota|

| Pokkesviricetes|

| Asfuvirales|

* Asfarviridae

|

Chitovirales|

* Poxviridae

Megaviricetes|

| Algavirales|

* Phycodnaviridae

|

Imitervirales|

* Mimiviridae

Pimascovirales|

* Ascoviridae
* Iridoviridae
* Marseilleviridae

Preplasmiviricota|

| Maveriviricetes|

| Priklausovirales|

* Lavidaviridae

|

Tectiliviricetes|

| Belfryvirales|

* Turriviridae

|

Kalamavirales|

* Tectiviridae

Rowavirales|

* Adenoviridae

Vinavirales|

* Corticoviridae

Helvetiavirae|

| Dividnaviricota|

| Laserviricetes|

| Halopanivirales|

* Sphaerolipoviridae

|

Unassigned|

| Ligamenvirales|

* Lipothrixviridae
* Rudiviridae

|

Unassigned|

* Families: Ampullaviridae
* Baculoviridae
* Bicaudaviridae
* Clavaviridae
* Fuselloviridae
* Globuloviridae
* Guttaviridae
* Halspiviridae
* Hytrosaviridae
* Nimaviridae
* Nudiviridae
* Ovaliviridae
* Plasmaviridae
* Polydnaviridae
* Portogloboviridae
* Thaspiviridae
* Tristromaviridae
* Genera: Dinodnavirus
* Rhizidiovirus

II: ssDNA viruses

| Monodnaviria|

| Loebvirae|

| Hofneiviricota|

| Faserviricetes|

| Tubulavirales|

* Inoviridae
* Plectroviridae

|

Sangervirae|

| Phixviricota|

| Malgrandaviricetes|

| Petitvirales|

* Microviridae

|

Shotokuvirae|

| Cossaviricota|

| Mouviricetes|

| Polivirales|

* Bidnaviridae

|

Quintoviricetes|

| Piccovirales|

* Parvoviridae

|

Cressdnaviricota|

| Arfiviricetes|

| Baphyvirales|

* Bacilladnaviridae

|

Cirlivirales|

* Circoviridae

Cremevirales|

* Smacoviridae

Mulpavirales|

* Nanoviridae

Recrevirales|

* Redondoviridae

Repensiviricetes|

| Geplafuvirales|

* Naminiviridae
* Geminiviridae
* Genomoviridae

|

Trapavirae|

| Saleviricota|

| Huolimaviricetes|

| Haloruvirales|

* Pleolipoviridae

|

Unassigned|

* Families: Anelloviridae
* Finnlakeviridae
* Spiraviridae

RNA|

III: dsRNA viruses

| Riboviria|

| Orthornavirae|

| Duplornaviricota|

| Chrymotiviricetes|

| Ghabrivirales|

* Chrysoviridae
* Megabirnaviridae
* Quadriviridae
* Totiviridae

|

Resentoviricetes|

| Reovirales|

* Reoviridae

|

Vidaverviricetes|

| Mindivirales|

* Cystoviridae

|

Pisuviricota|

| Duplopiviricetes|

| Durnavirales|

* Amalgaviridae
* Hypoviridae
* Picobirnaviridae
* Partitiviridae

|

Unassigned|

* Families: Birnaviridae
* Polymycoviridae
* Genera: Botybirnavirus

IV: (+)ssRNA viruses (primarily icosahedral)

| Riboviria|

| Orthornavirae|

| Kitrinoviricota|

| Alsuviricetes|

| Hepelivirales|

* Alphatetraviridae
* Benyviridae
* Hepeviridae
* Matonaviridae

|

Martellivirales|

* Bromoviridae
* Closteroviridae
* Endornaviridae
* Kitaviridae
* Mayoviridae
* Togaviridae
* Virgaviridae

Tymovirales|

* Alphaflexiviridae
* Betaflexiviridae
* Deltaflexiviridae
* Gammaflexiviridae
* Tymoviridae

Flasuviricetes|

| Amarillovirales|

* Flaviviridae

|

Magsaviricetes|

| Nodamuvirales|

* Nodaviridae
* Sinhaliviridae

|

Tolucaviricetes|

| Tolivirales|

* Carmotetraviridae
* Luteoviridae
* Tombusviridae

|

Lenarviricota|

| Allassoviricetes|

| Levivirales|

* Leviviridae

|

Amabiliviricetes|

| Wolframvirales|

* Narnaviridae

|

Howeltoviricetes|

| Cryppavirales|

* Mitoviridae

|

Miaviricetes|

| Ourlivirales|

* Botourmiaviridae

|

Pisuviricota|

| Pisoniviricetes|

| Nidovirales|

* Abyssoviridae
* Arteriviridae
* Cremegaviridae
* Coronaviridae
* Euroniviridae
* Gresnaviridae
* Medioniviridae
* Mesoniviridae
* Mononiviridae
* Nanghoshaviridae
* Nanhypoviridae
* Olifoviridae
* Roniviridae
* Tobaniviridae

|

Picornavirales|

* Picornaviridae
* Marnaviridae
* Solinviviridae
* Caliciviridae
* Iflaviridae
* Secoviridae
* Dicistroviridae
* Polycipiviridae

Sobemovirales|

* Alvernaviridae
* Barnaviridae
* Solemoviridae

Stelpaviricetes|

| Patatavirales|

* Potyviridae

|

Stellavirales|

* Astroviridae

Unassigned|

* Families: Permutotetraviridae
* Sarthroviridae

V: (–)ssRNA viruses (primarily helical)

| Riboviria|

| Orthornavirae|

| Negarnaviricota|

| Chunqiuviricetes|

| Muvirales|

* Qinviridae

|

Ellioviricetes|

| Bunyavirales|

* Cruliviridae
* Arenaviridae
* Fimoviridae
* Hantaviridae
* Leishbuviridae
* Mypoviridae
* Nairoviridae
* Peribunyaviridae
* Phasmaviridae
* Phenuiviridae
* Tospoviridae
* Wupedeviridae

|

Insthoviricetes|

| Articulavirales|

* Amnoonviridae
* Orthomyxoviridae

|

Milneviricetes|

| Serpentovirales |

* Aspiviridae

|

Monjiviricetes|

| Jingchuvirales|

* Chuviridae

|

Mononegavirales|

* Artoviridae
* Bornaviridae
* Filoviridae
* Lispiviridae
* Mymonaviridae
* Nyamiviridae
* Paramyxoviridae
* Pneumoviridae
* Rhabdoviridae
* Sunviridae
* Xinmoviridae

Yunchangviricetes|

| Goujianvirales|

* Yueviridae

|

Unassigned|

* Genera: Deltavirus

RT|

VI: ssRNA-RT viruses

| Riboviria|

| Pararnavirae|

| Artverviricota|

| Revtraviricetes|

| Ortervirales|

* Belpaoviridae
* Metaviridae
* Pseudoviridae
* Retroviridae

|

VII: dsDNA-RT viruses

| Riboviria|

| Pararnavirae|

| Artverviricota|

| Revtraviricetes|

| Blubervirales|

* Hepadnaviridae

|

Ortervirales|

* Caulimoviridae

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