Pandoravirus
Pandoravirus is a genus of very large viruses. They have the largest genomes of any viral genus. Like the other large viruses Mimivirus, Pithovirus and Megavirus, Pandoravirus infects amoebas. Its genome, with 1.9 to 2.5 megabases of DNA, is twice as large as that of Megavirus. It differs greatly from the other large viruses in appearance and in genome structure.