Megavirus

Megavirus is a virus with a single identified species, "Megavirus chilensis" (MGVC). It is phylogenetically related to or Mimivirus (APMV). 
MGVC is usually referred to as just “Megavirus”. Until the discovery of pandoraviruses in 2013 it had the largest capsid diameter of all known viruses, and the largest and most complex genome among all known viruses.