Black Lithosemoeba

Some Lithosemoeba developed a new organelle that allowed them to use light for energy, as a result the cells becoming much darker in coloration to gather as much light as possible, becoming the Black Lithosemoeba. They have lost much of their ability to move as a colony, and are mainly sessile, so and have given up entirely on feeding on organic matter. They are only able to move when at an earlier stage of the colony's life, where it can sorta swim around to find a suitable spot to settle down. The way they photosynthesize is a lot like plants irl, though they absorb every color to get the most out of it.