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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 characterized by a collarlike extension surrounding the anterior and through which the single flagellum emerges.
See also: amastigote, epimastigote, promastigote, trypomastigote.
[G. choanē, a funnel, + mastix, whip]
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collar flagellate

any stalked protozoan that occurs either singly or in branching colonies, possessing a FLAGELLUM surrounded by a cup-like structure into which food particles are wafted by flagellar movement. They are very similar to CHOANOCYTE cells.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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Bioinformatics studies have revealed TRP channels in the genomes of unicellular organisms including representatives of Choanoflagellata, Chlorophyta, Dictyostelia, Euglenozoa, Ciliophora, and Thecomonadea (Cai and Clapham, 2012; Arias-Darraz et al., 2015a; Peng et al., 2015), indicating that these channels are highly evolutionarily conserved.
The Methanococcus voltae (Archaea) and Monosiga brevicollis (Choanoflagellata) proteins were excluded automatically, while clustering with Giardia intestinalis (Fornicata) Hop1 at the step of Cobalt tree construction.
A microscopical study of a marine species of Codosiga James-Clark (Choanoflagellata) with special reference to the ingestion of bacteria.