Etymology of Taxon Names

The information below provides a list containing descriptions of the origins of ICTV taxon names starting at the rank of realm and going down to the rank of family. This information is derived from the proposals that were submitted when each taxon was created. Links to these proposals, links to ICTV report chapters, and links to publications (through PMIDs) are provided when available.

We thank Stuart Siddell for compiling this list of name origins. Etymological information for taxa below the rank of family, can be found in the relevant ICTV Online (10th) Report chapters. If you have any comments or corrections, please contact us by sending an email to info@ictv.global.

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Enter all or part of a taxon name (family rank or higher)

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Taxon: Nudiviridae Rank: family
Lineage: Naldaviricetes | Lefavirales | Nudiviridae
Proposal: 2013.003a-kI.A.v1.Nudiviridae.pdf
Report Chapter: Nudiviridae

Etymology: from the Latin nudus, meaning "naked", part of a previously used name nudibaculovirus, describing viruses with rod-shaped nucleocapsids lacking a protein matrix such as polyhedrin or granulin; the suffix ‑viridae for family taxa

Taxon: Alphanudivirus Rank: genus
Lineage: Naldaviricetes | Lefavirales | Nudiviridae | Alphanudivirus
Report Chapter: Nudiviridae
Taxon: Betanudivirus Rank: genus
Lineage: Naldaviricetes | Lefavirales | Nudiviridae | Betanudivirus
Report Chapter: Nudiviridae
Taxon: Deltanudivirus Rank: genus
Lineage: Naldaviricetes | Lefavirales | Nudiviridae | Deltanudivirus
Report Chapter: Nudiviridae
Taxon: Gammanudivirus Rank: genus
Lineage: Naldaviricetes | Lefavirales | Nudiviridae | Gammanudivirus
Report Chapter: Nudiviridae
Taxon: Nimaviridae Rank: family
Lineage: Naldaviricetes | Nimaviridae
Proposal: Ratification_2002a.pdf
Report Chapter: Nimaviridae
PubMed ID: 30404800

Etymology: from the Hebrew nima, meaning “thread”, referring to the thread- or tail-like polar extension (appendage) on virions of some viruses in the family; the suffix ‑viridae for family taxa

Taxon: Whispovirus Rank: genus
Lineage: Naldaviricetes | Nimaviridae | Whispovirus
Report Chapter: Nimaviridae
Taxon: Alphasatellitidae Rank: family
Lineage: Alphasatellitidae
Proposal: 2017.004P.A.v4.Alphasatellitidae.zip

Etymology: from the Ancient Greek ἄλφα (álpha), the first letter of the Greek alphabet and the Latin satellit, meaning "attendent", referring to mobile genetic elements that are dependent upon a helper virus to spread. The suffix -satelittidae is used for satelitte family taxa

Taxon: Ampullaviridae Rank: family
Lineage: Ampullaviridae
Proposal: 2005.088B.04.Ampullaviridae.pdf
Report Chapter: Ampullaviridae

Etymology: from the Latin ampulla, meaning "bottle", referring to the unique bottle-shaped morphology of the virion; the suffix ‑viridae for family taxa

Taxon: Bottigliavirus Rank: genus
Lineage: Ampullaviridae | Bottigliavirus
Report Chapter: Ampullaviridae
Taxon: Avsunviroidae Rank: family
Lineage: Avsunviroidae
Proposal: Ratification_1998.pdf
Report Chapter: Avsunviroidae
PubMed ID: 11050945

Etymology: from a member of the family, Avocado sunblotch viroid, an infectious agent consisting only of naked RNA; the suffix -viroidae is used for viroid family taxa

Taxon: Avsunviroid Rank: genus
Lineage: Avsunviroidae | Avsunviroid
Report Chapter: Avsunviroidae
Taxon: Elaviroid Rank: genus
Lineage: Avsunviroidae | Elaviroid
Report Chapter: Avsunviroidae
Taxon: Pelamoviroid Rank: genus
Lineage: Avsunviroidae | Pelamoviroid
Report Chapter: Avsunviroidae
Taxon: Bartogtaviriformidae Rank: family
Lineage: Bartogtaviriformidae
Proposal: 2022.001G.GTA_viriforms.zip

Etymology: from the host genus name Bartonella and gene transfer agent; the suffix -viriformidae is used for viriform family taxa

Taxon: Basaltiviridae Rank: family
Lineage: Basaltiviridae
Proposal: 2025.001A.Ac.v3.Crust_viruses_6nf.zip

Etymology: from the Latin basaltes, meaning "basalt", referring to the environment in which these viruses were found; the suffix ‑viridae for family taxa

Taxon: Bicaudaviridae Rank: family
Lineage: Bicaudaviridae
Proposal: 2007.090-2B.Bicaudaviridae.pdf
Report Chapter: Bicaudaviridae

Etymology: from the Latin bi meaning "two" and the Latin cauda meaning " tail", referring to the virion morhologlogy of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Bicaudavirus Rank: genus
Lineage: Bicaudaviridae | Bicaudavirus
Report Chapter: Bicaudaviridae
Taxon: Brachygtaviriformidae Rank: family
Lineage: Brachygtaviriformidae
Proposal: 2022.001G.GTA_viriforms.zip

Etymology: from the host genus name Brachyspira and gene transfer agent; the suffix -viriformidae is used for viriform family taxa

Taxon: Clavaviridae Rank: family
Lineage: Clavaviridae
Proposal: 2010.002a-gB.A.v2.Clavaviridae.zip
Report Chapter: Clavaviridae

Etymology: from Latin clava, meaning "club" or "stick", referring to the rigid, bacilliform virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Clavavirus Rank: genus
Lineage: Clavaviridae | Clavavirus
Report Chapter: Clavaviridae
Taxon: Eurekaviridae Rank: family
Lineage: Eurekaviridae
Proposal: 2024.007A.Eurekaviridae_newfam.zip

Etymology: from the Greek Eureka meaning “I have found it”, also the name of common variety of lemons, reminiscent of the virion shape; the suffix ‑viridae for family taxa

Taxon: Fuselloviridae Rank: family
Lineage: Fuselloviridae
Proposal: Ratification_1990.pdf
Report Chapter: Fuselloviridae
PubMed ID: 7903037

Etymology: from the Latin fusillo, meaning "little spindle", referring to the virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Globuloviridae Rank: family
Lineage: Globuloviridae
Proposal: 2005.081-3B.04.Globuloviridae.pdf
Report Chapter: Globuloviridae

Etymology: from the Latin globulus, meaning “small ball”, referring to the virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Alphaglobulovirus Rank: genus
Lineage: Globuloviridae | Alphaglobulovirus
Report Chapter: Globuloviridae
Taxon: Guttaviridae Rank: family
Lineage: Guttaviridae
Proposal: 2003.Bxxx.Prokaryote.pdf
Report Chapter: Guttaviridae

Etymology: from the Latin gutta, meaning "drop", referring to the droplet-shaped virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Betaguttavirus Rank: genus
Lineage: Guttaviridae | Betaguttavirus
Report Chapter: Guttaviridae
Taxon: Halspiviridae Rank: family
Lineage: Halspiviridae
Proposal: 2019.059B.zip
Report Chapter: Halspiviridae

Etymology: from halophilic, referring to the halophilic archaeal hosts of viruses in the family and spindle-shaped, referring to virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Huangdiviridae Rank: family
Lineage: Huangdiviridae
Proposal: 2024.005A.Bathyarchaeia_4newfam.zip

Etymology: from Huangdi, the legendary Chinese sovereign often associated with important inventions; the suffix ‑viridae for family taxa

Taxon: Itzamnaviridae Rank: family
Lineage: Itzamnaviridae
Proposal: 2022.001A.Nakonvirales_Maximonvirales_Coyopavirales_3no.zip

Etymology: from Itzamna, Lord of the Heavens as well as night and day in the Mayan mythology; the suffix ‑viridae for family taxa; connection unclear

Taxon: Lomiviridae Rank: family
Lineage: Lomiviridae
Proposal: 2025.005A.Ac.v3.Spindle-shaped_viruses_2nf_3ns.zip

Etymology: from the Amharic ሎሚ (lomi), meaning "lemon", referring to the morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Nipumfusiviridae Rank: family
Lineage: Nipumfusiviridae
Proposal: 2024.003A.Nipumfusiviridae_newfam.zip
Report Chapter: Nipumfusiviridae

Etymology: from the deduced host Nitrosopumilaceae and from the Latin fusi meaning spindles referring to the the possible morphology; the suffix ‑viridae for family taxa

Taxon: Obscuriviridae Rank: family
Lineage: Obscuriviridae
Proposal: 2024.025B.Obscuriviridae_1nf_2ng_3ns.zip

Etymology: from the Latin obscurus, meaning ambiguous or uncertain, referring to unresolved status of the family; the suffix -viridae for family taxa

Taxon: Ovaliviridae Rank: family
Lineage: Ovaliviridae
Proposal: 2018.104B.A.v1.Ovaliviridae.zip
Report Chapter: Ovaliviridae

Etymology: from the Latin ovalis, meaning "egg shaped", referring to the virion capsid architechture of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Alphaovalivirus Rank: genus
Lineage: Ovaliviridae | Alphaovalivirus
Report Chapter: Ovaliviridae
Taxon: Plasmaviridae Rank: family
Lineage: Plasmaviridae
Proposal: Ratification_1978.pdf
Report Chapter: Plasmaviridae
PubMed ID: 2982026

Etymology: from the Ancient Greek πλάσμα (plásma), meaning “something formed”, referring to the plastic virion shape of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Plasmavirus Rank: genus
Lineage: Plasmaviridae | Plasmavirus
Report Chapter: Plasmaviridae
Taxon: Polydnaviriformidae Rank: family
Lineage: Polydnaviriformidae
Proposal: 2021.006D.R.Polydnaviriformidae_1renfam_3rensp.zip

Etymology: from the Ancient Greek πολύς (polús), meaning “many" and DNA for deoxyribonucleic acid, referring to the multiple segments of dsDNA genomes of agents in the family; the suffix -viriformidae is used for viriform family taxa

Taxon: Portogloboviridae Rank: family
Lineage: Portogloboviridae
Proposal: 2017.002B.A.v2.Portogloboviridae.zip
Report Chapter: Portogloboviridae

Etymology: from the Latin portare, meaning ‘to carry’ and globus, meaning ‘a ball’, referring to the round shape of the nucleoprotein virion core of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Alphaportoglobovirus Rank: genus
Lineage: Portogloboviridae | Alphaportoglobovirus
Report Chapter: Portogloboviridae
Taxon: Pospiviroidae Rank: family
Lineage: Pospiviroidae
Proposal: Ratification_1998.pdf
Report Chapter: Pospiviroidae
PubMed ID: 9572562

Etymology: from a member of the family, potato spindle tuber viroid, an infectious agent consisting only of naked RNA; the suffix -viroidae for viroid family taxa

Taxon: Apscaviroid Rank: genus
Lineage: Pospiviroidae | Apscaviroid
Report Chapter: Pospiviroidae
Taxon: Cocadviroid Rank: genus
Lineage: Pospiviroidae | Cocadviroid
Report Chapter: Pospiviroidae
Taxon: Coleviroid Rank: genus
Lineage: Pospiviroidae | Coleviroid
Report Chapter: Pospiviroidae
Taxon: Hostuviroid Rank: genus
Lineage: Pospiviroidae | Hostuviroid
Report Chapter: Pospiviroidae
Taxon: Pospiviroid Rank: genus
Lineage: Pospiviroidae | Pospiviroid
Report Chapter: Pospiviroidae
Taxon: Rhodogtaviriformidae Rank: family
Lineage: Rhodogtaviriformidae
Proposal: 2022.001G.GTA_viriforms.zip

Etymology: from the host order name Rhodobacterales and gene transfer agent; the suffix -viriformidae is used for viriform family taxa

Taxon: Spiraviridae Rank: family
Lineage: Spiraviridae
Proposal: 2013.003a-gB.A.v3.Spiraviridae.pdf
Report Chapter: Spiraviridae

Etymology: from the Latin spira, meaning “coil”, referring to virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Alphaspiravirus Rank: genus
Lineage: Spiraviridae | Alphaspiravirus
Report Chapter: Spiraviridae
Taxon: Thaspiviridae Rank: family
Lineage: Thaspiviridae
Proposal: 2019.092B.zip
Report Chapter: Thaspiviridae

Etymology: from thaumarchaeal and spindle-shaped virus, referring to the host and virion morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Nitmarvirus Rank: genus
Lineage: Thaspiviridae | Nitmarvirus
Report Chapter: Thaspiviridae
Taxon: Tolecusatellitidae Rank: family
Lineage: Tolecusatellitidae
Proposal: 2016.021a-kP.A.v2.Tolecusatellitidae.pdf

Etymology: from tomato leaf curl virus satellite, the first DNA satellite shown to be associated with geminiviruses and the Latin satellit, meaning "attendent", referring to mobile genetic elements that are dependent upon a helper virus to spread. The suffix -satellitidae is used for satellite family taxa

Taxon: Xigoviridae Rank: family
Lineage: Xigoviridae
Proposal: 2025.005A.Ac.v3.Spindle-shaped_viruses_2nf_3ns.zip

Etymology: from the Afar xigô (xigo), meaning "lemon", referring to the morphology of viruses in the family; the suffix ‑viridae for family taxa

Taxon: Yamazakiviridae Rank: family
Lineage: Yamazakiviridae
Proposal: 2025.006A.Ac.v3.Yamazakiviridae_1nf.zip

Etymology: to honour Syuji Yamazaki, the Japanese microbiologist for his pioneering work on Aeropyrum pernix, the host of Aeropyrum pernix spindle-shaped virus 1; the suffix ‑viridae for family taxa