Answer:
Some unicellular eukaryotic organisms contain mitosomes, which are organelles. The mitosome has only recently been discovered and given its name and little is known about how it works. It is occasionally known as a Crypton.
The mitosome has been detected only in anaerobic or microaerophilic organisms which do not have mitochondria. These organisms do not have the capability of gaining energy from oxidation, which is normally performed by mitochondria. The mitosome was first described in Entamoeba histolytica, an intestinal parasite of humans. Mitosomes have also been identified in several species of Microsporidia and in Giardia intestinalis.