Amoeba dubia

The Amoeba dubia is the largest species of the genus Amoebozoa, more commonly referred to as Amoeba. It is a genus of protozoa that moves by means of temporary projections called pseudopods, and is well-known as a representative unicellular organism. It can be as large as a millimeter in length, and can be viewed with the naked eye.

The Amoeba dubia also has the largest genome known to date. This protozoan genome has 670 billion base pairs of DNA, over 200 times larger than the human genome. The genome of a cousin, Amoeba proteus, has a mere 290 billion base pairs.