Euglena's chloroplasts are surrounded by three membranes, while those of plants and the green algae (among which earlier taxonomists often placed Euglena) have only two membranes.
Os cloroplastos de Euglena están rodeados de tres membranas, mentres que os das plantas e os das algas verdes (entre as cales os primeiros taxonomistas adiotaban situar a Euglena) só están rodeados de dúas.