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Protista British & World English

A kingdom or large grouping that comprises mostly single-celled organisms such as the protozoa, simple algae and fungi, slime moulds, and (formerly) the bacteria. They are now divided among up to thirty phyla, and some have both plant and animal characteristics

Protista in alga British & World English

A simple, non-flowering, and typically aquatic plant of a large assemblage that includes the seaweeds and many single-celled forms. Algae contain chlorophyll but lack true stems, roots, leaves, and vascular tissue

Protista in amoeba British & World English

A single-celled animal which catches food and moves about by extending finger-like projections of protoplasm. Amoebas are either free-living in damp environments or parasitic

Protista in blanket weed British & World English

A common green freshwater alga which forms long unbranched filaments, sometimes becoming a problem in over-enriched water and garden ponds

Protista in brown algae British & World English

A large group of algae that are typically olive brown or greenish in colour, including many seaweeds. They contain xanthophyll in addition to chlorophyll

Protista in chlamydomonas British & World English

A common single-celled green alga which typically has two flagella for swimming, living in water and moist soil

Protista in chlorella British & World English

A common single-celled green alga of both terrestrial and aquatic habitats, responsible for turning stagnant water an opaque green

Protista in Chlorophyta British & World English

A division of lower plants that comprises the green algae. They are frequently treated as a phylum of the kingdom Protista

Protista in ciliate British & World English

A single-celled animal of a large and diverse phylum distinguished by the possession of cilia or ciliary structures

Protista in desmid British & World English

A single-celled freshwater alga which appears to be composed of two rigid cells with a shared nucleus. The presence of desmids is usually an indicator of unpolluted water

Protista in diatom British & World English

A single-celled alga which has a cell wall of silica. Many kinds are planktonic, and extensive fossil deposits have been found

Protista in dinoflagellate British & World English

A single-celled organism with two flagella, occurring in large numbers in marine plankton and also found in fresh water. Some produce toxins that can accumulate in shellfish, resulting in poisoning when eaten

Protista in East Coast Fever British & World English

A feverish disease of cattle, prevalent in Africa and usually fatal

Protista in entamoeba British & World English

An amoeba that typically lives harmlessly in the gut, though one kind can cause amoebic dysentery

Protista in euglena British & World English

A green single-celled freshwater organism with a flagellum, sometimes forming a green scum on stagnant water

Protista in flagellate2 British & World English

A protozoan that has one or more flagella used for swimming

Protista in foraminifer British & World English

A single-celled planktonic animal with a perforated chalky shell through which slender protrusions of protoplasm extend. Most kinds are marine, and when they die thick ocean-floor sediments are formed from their shells

Protista in giardiasis British & World English

Infection of the intestine with a flagellate protozoan, which causes diarrhoea and other symptoms

Protista in globigerina British & World English

A planktonic marine protozoan with a calcareous shell. The shells collect as a deposit (globigerina ooze) over much of the ocean floor

Protista in green algae British & World English

Photosynthetic algae which contain chlorophyll and store starch in discrete chloroplasts. They are eukaryotic and most live in fresh water, ranging from unicellular flagellates to more complex multicellular forms

Protista in Heliozoa British & World English

A phylum of single-celled aquatic animals that are related to the radiolarians. They have a spherical shell with fine radiating needle-like projections

Protista in kala-azar British & World English

A form of the disease leishmaniasis marked by emaciation, anaemia, fever, and enlargement of the liver and spleen

Protista in leishmania British & World English

A single-celled parasitic protozoan which spends part of its life cycle in the gut of a sandfly and part in the blood and other tissues of a vertebrate

Protista in Mastigophora British & World English

A group of single-celled animals that includes the protozoal flagellates, which are now generally divided among several phyla of the kingdom Protista

Protista in myxomycete British & World English

A slime mould, especially an acellular one whose vegetative stage is a multinucleate plasmodium

Protista in nosema British & World English

A spore-forming parasitic protozoan that chiefly affects insects

Protista in paramecium British & World English

A single-celled freshwater animal which has a characteristic slipper-like shape and is covered with cilia

Protista in Phaeophyceae British & World English

A class of lower plants that comprises the brown algae

Protista in Protozoa British & World English

A phylum or grouping of phyla which comprises the single-celled microscopic animals, which include amoebas, flagellates, ciliates, sporozoans, and many other forms. They are now usually treated as a number of phyla belonging to the kingdom Protista

Protista in protozoan British & World English

A single-celled microscopic animal of a group of phyla of the kingdom Protista, such as an amoeba, flagellate, ciliate, or sporozoan

Protista in radiolarian British & World English

A single-celled aquatic animal which has a spherical amoeba-like body with a spiny skeleton of silica. Their skeletons can accumulate as a slimy deposit on the seabed

Protista in red algae British & World English

A large group of algae that includes many seaweeds that are mainly red in colour. Some kinds yield useful products (agar, alginates) or are used as food (laver, dulse, carrageen)

Protista in slime mould British & World English

A simple organism that consists of an acellular mass of creeping jelly-like protoplasm containing nuclei, or a mass of amoeboid cells. When it reaches a certain size it forms a large number of spore cases

Protista in stentor British & World English

A sedentary trumpet-shaped single-celled animal that is widespread in fresh water

Protista in trichomonad British & World English

A parasitic protozoan with four to six flagella and an undulating membrane, infesting the urogenital or digestive system

Protista in trypanosome British & World English

A single-celled parasitic protozoan with a trailing flagellum, infesting the blood

Protista in volvox British & World English

A green single-celled aquatic organism which forms minute free-swimming spherical colonies

Protista in vorticella British & World English

A sedentary, single-celled aquatic animal with a contractile stalk and a bell-shaped body bearing a ring of cilia

Protista in water mold British & World English

Any of a group of fungi-like organisms that live in water or soil, many of which are parasitic on plants