Mimivirus is an extra-large virus. It was discovered in 1992.
APMV was found accidentally inside the amoebaAcanthamoeba polyphaga. The virus was seen in a gram stain and mistakenly thought to be a gram-positivebacterium.
It is either a viralgenus with a single species, Acanthamoeba polyphaga mimivirus (APMV), or it is a group of phylogenetically-related large viruses (MimiN).