There's also the trichoplax, a kind of "tribe" of cells that is "made up of a few thousand cells of six types in three distinct layers: dorsal epithelia cells a

There's also the trichoplax, a kind of "tribe" of cells that is "made up of a few thousand cells of six types in three distinct layers: dorsal epithelia cells and ventral epithelia cells, each with a single cilium ("monociliate"), ventral gland cells, syncytial fiber cells, lipophils, and crystal cells (each containing a birefringent crystal, arrayed around the rim)." They can be pressed through a sieve so that the cells split apart and move as individuals. The cells will reform the organism. Two trichoplax organisms can be split like this and the cells from each will reform with each other. https://en.wikipedia.org/wiki/Trichoplax https://en.wikipedia.org/wiki/Trichoplax