kingdom Protoctista, Protoctista - in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals

genus Amoeba - protozoan inhabiting moist soils or bottom vegetation in fresh or salt water

Endamoeba, genus Endamoeba - the type genus of the family Endamoebidae

genus Globigerina - type genus of the family Globigerinidae

genus Arcella - type genus of the Arcellidae

genus Difflugia - genus of protozoans related to Amoeba

genus Paramecium - freshwater ciliate with an oval body and long deep oral groove

genus Tetrahymena - protozoa having four membranous ciliary organelles

genus Stentor - trumpet-shaped protozoa with a ciliated spiral feeding funnel

genus Vorticella - ciliated protozoans that have a goblet-shaped body with a retractile stalk

genus Conferva, genus Tribonema, Tribonema - type genus of Tribonemaceae

genus Laminaria, Laminaria - type genus of the family Laminariaceae: perennial brown kelps

genus Fucus - type genus of the family Fucaceae: cartilaginous brown algae

Ascophyllum, genus Ascophyllum - brown algae distinguished by compressed or inflated branchlets along the axis

genus Sargassum - a genus of protoctista

genus Euglena - type genus of the family Euglenaceae: green algae with a single flagellum

genus Ulva, Ulva - type genus of the family Ulvaceae; green seaweed having a thallus two cells thick: sea lettuce

genus Volvox, Volvox - type genus of the Volvocaceae; minute pale green flagellates occurring in tiny spherical colonies; minute flagella rotate the colony about an axis

Chlamydomonas, genus Chlamydomonas - type genus of the Chlamydomonadaceae; solitary doubly-flagellated plant-like algae common in fresh water and damp soil; multiply freely; often a pest around filtration plants

genus Zygnema, Zygnema - type genus of the family Zygnemataceae

genus Spirogyra - a genus of protoctista

Chlorococcum, genus Chlorococcum - type genus of Chlorococcales; unicellular green algae occurring singly or in a layer on soil or damp rock

genus Chlorella - nonmotile unicellular green algae potentially important as source of high-grade protein and B-complex vitamins

genus Oedogonium, Oedogonium - type genus of Oedogoniaceae; freshwater green algae having long unbranched filaments; usually free-floating when mature

Chara, genus Chara - green algae common in freshwater lakes of limestone districts

genus Nitella, Nitella - fragile branching stoneworts

Desmidium, genus Desmidium - a genus of protoctista

Chondrus, genus Chondrus - a genus of protoctista

genus Rhodymenia, Rhodymenia - type genus of the family Rhodymeniaceae

genus Porphyra, Porphyra - a genus of protoctista

genus Noctiluca - a genus of protoctista

genus Peridinium, Peridinium - type genus of the family Peridiniidae

genus Costia - a genus of flagellate protoctista

genus Giardia - flagellates parasitic in intestines of vertebrates

Chilomastix, genus Chilomastix - flagellates parasitic in intestines of vertebrates including humans

genus Hexamita, Hexamita - flagellates free-living or parasitic in intestines of birds

genus Trichomonas - flagellates parasitic in alimentary or genitourinary tracts of vertebrates and invertebrates including humans

genus Eimeria - type genus of the family Eimeriidae; includes serious pathogens

genus Plasmodium - type genus of the family Plasmodiidae

genus Haemoproteus, Haemoproteus - type genus of the family Haemoproteidae

genus Leucocytozoan, genus Leucocytozoon - a genus of protoctista