Virus Taxonomy: Eighth Report Of The International Committee On Taxonomy Of Viruses

c. 2005

DS-DNA: second largest group

• one order
• three families
• several genera in each family

SS-DNA: small group

• it appears there is a single family in each order
• six or seven families

RT-DNA and RT-RNA viruses

• it appears there is a single family in each order
• five families

DS-RNA: moderate sized group

• it appears there is a single family in each order
• seven families

Negative Sense SS-RNA: small group

• one order
• four families
• several genera in most families

Positive Sense SS-RNA: largest group

• fourteen families, each one in one order
• one order with three families
• seven more families
• so: 24 families in all, it appears 18 orders

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Corona Virus

Positive Sense SS-RNA
the one order with multiple families: 

Order nidovirales

• family: Coronaviridae
• genus: Coronavirus
• genus: Togovirus
• family: Arteriviridae
• genus: Arterivirus
• family: Roniviridae
• genus: Okavirus

Biological properties:

Coronaviruses infect birds and many mammals, including humans. The respiratory tract, gastrointestinal tract and neurological tissues are the most frequent targets of coronaviruses but other organs including liver, kidney, heart, and eyes can also be affected.

Epithelial cells are the main target of coronaviruses, plus, with some coronavirus species, widely distributed cells such as macrophages.

Coronaviruses have a wider host range in vivo than would be expected from in vitro studies.

The cause of severe acute respiratory syndrome (SARS) in man is a coronavirus that is believed to have jumped from another animal species.

.... specific binding is required for the virus to establish infection.

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The Families In The Positive Sense SS-RNA Viruses

Family Leviviridae

• Genus: Levivirus
• Genus: Allolevivirus

Family Narnaviridae

• Genus: Narnavirus
• Genus: Mitovirus

Family Picornaviridae

• Genus Enterovirus
• Genus Rhinovirus
• Genus Cardiovirus
• Genus Aphthovirus
• Genus Hepatovirus
• Genus Parechovirus
• Genus Erbovirus
• Genus Kobuvirus
• Genus Teschovirus

• Genus  Iflavirus (unassigned?)

Family Dicisgtroviridae

• Genus Cripavirus

Family Marnaviridae

• Genus Marnavirus
• Genus Sequiviridae
• Genus Sequivirus
• Genus Waikavirus

• Genus Sadwavirus (unassigned?)
• Genus Cheravirus (unassigned?)

Family Comoviridae

• Genus Comovirus
• Genus Fabavirus
• Genus Nepovirus

Family Potyviridae

• Genus Potyvirus
• Genus Ipomovirus
• Genus Macluravirus
• Genus Rymovirus
• Genus Tritimovirus
• Genus Bymovirus

Family Caliciviridae

• Genus Lagovirus
• Genus Norovirus
• Genus Sapovirus
• Genus Vesivirus

• Genus Hepevirus (unassigned?)

Family Astroviridae

• Genus Avastrovirus
• Genus Mamastrovirus

Family Nodaviridae

• Genus Alphanodavirus
• Betanodavirus

• Genus Omegatetravirus (unassigned?)
• Genus Sobemovirus (unassigned?)

Family Luteoviridae

• Genus Luteovirus
• Genus Polerovirus
• Genus Enamovirus

• Genus Umbravirus (unassigned?)

Family Tombusviridae

• Genus Dianthovirus
• Genus Tombusvirus
• Genus Aureusvirus
• Genus Carmovirus
• Genus Necrovirus
• Genus Panicovirus
• Genus Machlomovirus

Order Nidovirales

• Family Coronaviridae

• Genus Coronavirus
• Genus Torovirus

• Family Arteriviridae

• Genus Arterivirus

• Family Roniviridae

• Genus Okavirus

Family Flaviviridae

• Genus Flavivirus
• Genus Pestivirus
• Genus Hepacivirus

Family Togaviridae

• Genus Alphavirus
• Genus Rubivirus

• Genus Tobamovirus (unassigned?)
• Genus Tobravirus (unassigned?)
• Genus Hordeivirus (unassigned?)
• Genus Furovirus (unassigned?)
• Genus Pomovirus (unassigned?)
• Genus Pecluvirus (unassigned?)
• Genus Benyvirus (unassigned?)

Familiy Bromoviridae

• Genus Alfamovirus
• Genus Bromovirus
• Genus Cucumovirus
• Genus Harvirus
• Genus Oleavirus

• Genus Ilarvirus (unassigned?)
• Genus Ourmiavirus (unassigned?)
• Genus   Idaeovirus (unassigned?)

Family Tymoviridae

• Genus Tymovirus
• Genus Marafivirus
• Genus Maculavirus

Family Closteroviridae

• Genus Closterovirus
• Genus Ampelovirus
• Genus Crinivirus

Family Flexiviridae

• Genus Potexvirus
• Genus Mandarivirus
• Genus Allexivirus
• Genus Carlavirus
• Genus Foveavirus
• Genus Capillovirus
• Genus Vitivirus
• Genus Trichovirus

Family Barnaviridae

• Genus Barnavirus

Then a long list of unassigned viruses.

Terminology

ORF (do not confuse with a disease by that name). New term for me:

In molecular genetics, an open reading frame (ORF) is the part of a reading frame that has the ability to be translated. ... In eukaryotic genes with multiple exons, introns are removed and exons are then joined together after transcription to yield the final mRNA for protein translation. See wiki.