any flagellate of the genera Monosiga and Proterospongia, having a protoplasmic collar encircling the base of the flagellum.
Origin of choanoflagellate
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Examples from the Web for choanoflagellate
Historical Examples of choanoflagellate
This minute form looked so much like a choanoflagellate that I supposed it to be one until I discovered an empty case (Fig. 8).Marine Protozoa from Woods Hole
Gary N. Calkins