Diplomastigomycotina
Sub-division: Diplomastigomycotina:- Flagellated cells bear two different types of flagella whiplash type as well as tinsel type. It includes 1 class - Oomycetes:- > Most of the members are aquatic but some grow on the soil and the others attack the shoots of terrestrial plants. > The primitive forms are unicellular, whereas the advanced forms have a well-developed branched, filamentous, and coenocytic mycelium. > The cell wall is mainly composed of cellulose-β-glucan and chitin is altogether absent. > A sexual reproduction takes place by means of pyriform or reniform biflagellate zoospores, which are devoid of cell wall. In pyriform zoospores, the flagella are attached anteriorly and in reniform laterally. One flagellum is of whiplash type and the other of tinsel type. > In primitive aquatic form, zoosporangia are not well differentiated from somatic hyphae, whereas in advanced forms distinct zoosprangia are found. > Some forms also produce non-motile a...