
The choanoflagellates are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals. As the name suggests, choanoflagellates (collared flagellates) have a distinctive cell morphology characterized by an ovoid or spherical cell body 3–10 µm in diameter with a single apical ...
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http://en.wikipedia.org/wiki/Choanoflagellate

any protozoan of the flagellate order Choanoflagellida (sometimes classified in the order Kinetoplastida) having a transparent food-gathering collar ... [2 related articles]
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http://www.britannica.com/eb/a-z/c/75

Synonym for choanomastigote ... A term, in the series used to describe developmental stages of the parasitic flagellates, denoting the 'barleycorn' form of the flagellate in the genus Crithidia characterised by a collarlike extension surrounding the anterior and through which the single flagellum emerges. ... See: amastigote, epimastigote, promasti...
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http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: kō′an-ō-flaj′ĕ-lāt Synonyms: choanomastigote
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http://www.medilexicon.com/medicaldictionary.php?t=16931

choanoflagellate A protozoon belonging to the order Choanoflagellida, marked by a collar at the base of the flagellum; collared flagellate.
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http://www.wordinfo.info/words/index/info/view_unit/452/

any flagellate of the genera Monosiga and Proterospongia, having a protoplasmic collar encircling the base of the flagellum.
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https://www.infoplease.com/dictionary/choanoflagellate
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