Wikipedia
Megavirus
Megavirus is a viral genus containing a single identified species named Megavirus chilensis (MGVC), phylogenetically related to Acanthamoeba polyphaga Mimivirus (APMV). In colloquial speech, MGVC is more commonly referred to as just “Megavirus”. Until the discovery of pandoraviruses in 2013 it had the largest capsid diameter of all known viruses, as well as the largest and most complex genome among all known viruses.