General MorphologyClassified by capsid structure revealed by electronmicroscopy and X-ray crystallography1.Polyhedral viruses: most common formicosahedral: 20 triangular faces and 12 cornersex. Adenoviruses, Polioviruses2.Enveloped viruses: roughly spherical, ex. Influenzaviruses3.Helical viruses: rigid or flexible long rods ex.Rhabdovirus (rabies virus), Filovirus (Ebola virus)4.Complex viruses: complex structure ex.Bacteriophages: capsid head + helical tailPoxvirus: no clear capsids but several coats