LISTING OF SELECTED VERTEBRATE VIRUS FAMILIES BY MORPHOLOGY Morphology of Particle Icosahedral Irregular Morphology of Nucleocapsid Poxviridae (ovoid) Yes Enveloped Round Coronaviridae Yes Helical or tubular Paramyxoviridae Yes Orthomyxoviridae Yes Rhabdoviridae (bacilliform) Yes Filoviridae Yes Bunyaviridae Yes Helical Arenaviridae Yes Helical Spherical Retroviridae Yes Togaviridae Yes T = 4 Flaviviridae Yes T = 3 Adenoviridae No T = 25 Papillomaviridae No P = 7 d Polyomaviridae No P = 7 d Parvoviridae No T = 1 Reoviridae No T = 13 l Picornaviridae No Astroviridae No Not applicable T = 3 Caliciviridae No Not applicable T = 3 Triangulation Number Herpesviridae Yes T = 16 Hepadnaviridae Yes Icosahedral T = 3 & 4 Table 2.1 ? F ilamentous Figure Numbers Not applicable Figures 2.1, 2.5, 2. Icosahedral Figures 2.1, 2.5, 2. Not applicable Figure 2.5 Not applicable Figures 2.5, 2.9 Not applicable Figures 2.1, 2.5 Not applicable Figures 2.1, 2.5, 2. Icosahedral Figures 2.1, 2.5, 2. Icosahedral Figures 2.5, 2.14, 2 Icosahedral Figure 2.5 Dumbbell Figures 2.1, 2.20 Coiled helix Figures 2.1, 2.19 Icosahedral? Figures 2.1, 2.17 Helical Figure 2.18 Helical Figures 2.1, 2.18 Helical Figure 2.19 a a,b a,b c c a Two mirror image structures can be formed using T = 13 or T = 7, a symmetry referred to a c Virions are often pleiomorphic P = 3 b Because the subunits are not exactly equivalent, Papillomaviridae , Polyomaviridae,and as well as poliovirus have “pseudo-triangulation numbers” so are referred to as P = 7, P = 7, and P symmetries respectively. b