Viral morphology can be helical (rod-shaped; tobacco mosaic virus,  Ebola and Marburg), icosahedral (20 evenly shaped triangular vertices; polio, rhinovirus, herpes, adenoviruses) or complex (many shapes; bacteriophages, rabies, smallpox).


The bacteriophage, such as T4 (above) is an example of a complex viral morphology.