Polychaos Dubium

Polychaos dubium is a freshwater amoeboid and one of the larger species of protist. Like other amoebozoans, P. dubium moves by means of temporary projections called pseudopods. P. dubium reportedly has the largest genome of any organism known.

Polychaos dubium was previously known as Amoeba dubia. The author who named the species later recognized it as different from species of Amoeba, and so designated it the type species of the genus Polychaos. Unlike species of Amoeba, P. dubium lacks longitudinal ridges on its pseudopods.