According to the ITIS Standard Report Page, the amoeba is scientifically considered a species or genus within the kingdom Protozoa. The species consists of shapeless unicellular organisms that reproduce asexually.
Specifically, amoebas are part of the phylum Amoebozoa, as described by Max Lühe in 1913. In 2002-2003, they were placed into the kingdom Protozoa by Thomas Cavalier-Smith. They are also classified under the domain Eukaryota, as described in 1998 by Cavalier-Smith. The species or genus was first described in 1822 by Bory de Saint-Vincent and later added to the family Amoebidae. There are four major subspecies of amoebas identified as of 2014.