Cell division
"Tetraselmis" species undergo cell division during the non-motile stage, producing two daughter cells, and most species only undergo one division cycle. During cell division, organelles divide synchronously before nuclear division. Cell division is aided by a phycoplast, which is a microtubule structure that helps the cell divide the nuclei into each daughter cell. Daughter cells can develop into flagellated cells or remain non-motile, depending on environmental conditions. Additionally, vegetative cells whether flagellate or immotile are anchored to the thecal wall by four microtubule contact points.