Bacteriophage

They are among the most complex viruses. Each of them is made up of at least five separate proteins; these make up the head, the tail core, the molecules of the capsid, the base -plate of the tail, and the tail fibers. A long DNA molecule is coiled within the head.
One the basis of morphology viruses are classified into rod shaped (T.M.V), spherical (Polio-virus) and tadpole like bacteriophage viruses etc.