Candidatus Uabimicrobium amorphum is a species of free-living aquatic Gram-negative bacteria discovered from the Republic of Palau. Collected in 2015 and described in 2019, it is the first known bacteria that can eat other microbes by the process called phagocytosis. Although there are several predatory bacteria that attack and kill other bacteria, this bacterium can engulf, ingest (the process called endocytosis) and digest whole bacteria. The ability to perform endocytosis in the bacterium gives the picture of primary symbiogenesis that led to the formation of eukaryotic cells.