Are there any organisms that are made of more than one (~5-12) cell? Prokaryotes and eukaryotes are unicellular, made of one cell. Great. Eukaryotes are unicellular or multicellular. But the typical examples of multicellular eukaryotes we have are made of, often, trillions of cells, like us humans. Ants must still be made of many millions of cells. Are there known eukaryotes with _very few_ cells that make them up? Like, 5, or something? Or maybe a dozen cells making up the whole organism in its fully developed state?

There's _Trichoplax adhaerens_, a Placozoa, made of a few thousand cells. Then there is _Dicyema japonicum_, a simple mesozoan, made up of 9 to 41 cells. Arguably, the simplest multicellular organism is the algae _Tetrabaena socialis_ , whose body consists of 4 cells. Then, there's the parasitic _Myxozoa_ which have 7 cells.