All mature diatoms lack flagella, but their gametes may be either amoeboid or flagellated.
At the tail end of the organism, generally, but diatoms, for instance, have flagella at the midline of their cell structure and other organisms have them in two or three places. Wherever they are located flagella are for locomotion,
Dinoflagellata has two flagella, one equatorial and one longitudinal. It uses these two flagella to whirl around (which is what their name means. dino in dinoflagellata means to whirl).
Unicellular organisms: some bacteria, spermatozoa. I think also diatoms and similar planktonic fauna.
Dinobacteria are tipically unicellular, with a large nucleus, two flagella,and several small chloroplasts containing photosynthetic pigments similar to those of diatoms
Most diatoms are non-motile, simply being carried by currents and turbulence - however, some types move via flagellation (the swimming motion of small hair-like features called 'flagella'). Flagella are projections from the cell body which are moved back and forth (flagellated) to provide motion. Identical in structure to flagella (but somewhat shorter in length), cilia are present in mammals primarily to facilitate the movement of fluids and mucus across tissues/membranes.
Flagella. Flagella Flagellum (flagella is the plural form) flagella
pennate diatoms
Diatoms are single celled algae.
diatoms are a microalgae group
Diatoms are algae, diatoms are protists. Diatoms are placed in the division Bacilliariophyta, which is distinguished by the presence of an inorganic cell wall composed of hydrated silica.
Diatoms are usually microscopic, but they can be 2mm in length. Marine diatoms are a yellowish brown colour.
cilia and flagella