Table 2.

Overview of archaeal virusesa

FamilyCapsid morphologyAdditional feature(s)Genome typeNo. of complete genomesExample
Crenarchaeal viruses
    FuselloviridaeSpindle shapedShort appendagesdsDNA, C9SSV1
    BicaudaviridaeSpindle shapedTwo tailsdsDNA, C1ATV
    GuttaviridaeDroplet shapedMultiple thin fibersdsDNA, CSNDV
    AmpullaviridaeBottle shapedShort filaments at the broader enddsDNA, L1ABV
    GlobuloviridaeSphericalHelical nucleoproteindsDNA, L2PSV
    LipothrixviridaeFilamentousEnveloped, flexible or rigiddsDNA, L8AFV1
    RudiviridaeStiff rodsThree terminal fibersdsDNA, L4SIRV1
    “ClavaviridaeRigid bacilliformOne pointed end, one rounded enddsDNA, C1APBV1
    NAIcosahedralInternal membranedsDNA, C2STIV
    NASpindle shapedOne taildsDNA, C1STSV1
Euryarchaeal viruses
    MyoviridaeIcosahedralTail (contractile)dsDNA, L3φCh1
    SiphoviridaeIcosahedralTail (long noncontractile)dsDNA, L2ψM2
    Salterprovirus (genus)Spindle shapeddsDNA, L2His1
    NASpindle shapedEnveloped(?)dsDNA, C1PAV1
    NAOblatedsDNA, CA3 VLP
    NAPleomorphicEnvelopedssDNA, C1HRPV-1
    NAPleomorphicEnvelopeddsDNA, C1HHPV-1
    NAIcosahedralInternal membranedsDNA, L1SH1
  • a Crenarchaeal and euryarchaeal viruses not assigned (NA) to families but displaying features distinguishing them from viruses belonging to approved families are indicated. L, linear; C, circular; VLP, virus-like particle; ATV, Acidianus two-tailed virus; SNDV, Sulfolobus neozealandicus droplet-shaped virus; APBV1, Aeropyrum pernix bacilliform virus 1; STSV1, Sulfolobus tengchongensis spindle-shaped virus 1.