Class Flagellata is a group of single-celled organisms with whip-like appendages called flagella, which they use to move around. While the term 'Class Flagellata' is common, there are several synonyms that can also be used to refer to these microorganisms. Some alternative names for the group include Mastigophora, Zoomastigophora, and Euglenozoa, all of which point to different aspects of the organisms' biology. Mastigophora accentuates the flagella that these cells possess, while Zoomastigophora implies the animal-like nature of their motility. Euglenozoa refers to the eukaryotic cells that make up the group, and also hints at their diverse range of shapes and lifestyles.