The term "Subdivision Mastigomycotina" refers to a group of fungi that possess flagellated spores (zoospores) during their life cycle. There are various synonyms used to describe this group of fungi, including zoosporic fungi, flagellated fungi, chytrids, and blastocladiales. The term "zoosporic fungi" emphasizes the importance of the flagellated spores, while "flagellated fungi" highlights the unique morphological feature of this group. "Chytrids" is a common term for this group, as they comprise the largest class of fungi in the subdivision Mastigomycotina. Finally, "blastocladiales" refers to a specific order within the Mastigomycotina that includes several species of water molds.