Marine predators of picoplankton include heterotrophic flagellates and ciliates. They nourish on diatoms, unicellular green algae or animal protozoa such as flagellates and ciliates. These microbes include viruses, bacteria, algae, heterotrophic protists (such as ciliates and flagellates). Most excavates are unicellular, heterotrophic flagellates. Protozoa can be split up into three categories&colon; flagellates, amoebae and ciliates. Protozoans, including flagellates, ciliates, sporozoans, and nematodes have been detected in land planarians. Their diet includes algae, diatoms, flagellates, peridinians, small invertebrate larvae, and detritus. Many protists take the form of single-celled flagellates. His protista were divided into moneres, protoplasts, flagellates, diatoms, myxomycetes, myxocystodes, rhizopods, and sponges. Trypanosamatid flagellates, nematodes, and parasitic Hymenoptera all act as endoparasites. Euglenophytes are a phylum of unicellular flagellates with only a few marine members. Proctodeal trophallaxis is also used to replenish flagellates and other gut symbionts after each moult. Unicellular flagellates, amoeboid and palmelloid taxa were not included in this study. In some flagellates, flagella direct food into a cytostome or mouth, where food is ingested. In contrast, most other flagellates are "pulled" by their flagella.